diff --git a/docs/trulens_eval/all_tools.ipynb b/docs/trulens_eval/all_tools.ipynb
index 39bde7bc5..51eb60527 100644
--- a/docs/trulens_eval/all_tools.ipynb
+++ b/docs/trulens_eval/all_tools.ipynb
@@ -28,7 +28,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "# ! pip install trulens_eval openai langchain langchain-openai faiss-cpu bs4 tiktoken"
+    "# ! pip install trulens_eval openai langchain langchain-openai langchain_community faiss-cpu bs4 tiktoken"
    ]
   },
   {
diff --git a/trulens_eval/examples/expositional/end2end_apps/trubot/webindex.ipynb b/trulens_eval/examples/expositional/end2end_apps/trubot/webindex.ipynb
index 911cdc46f..2482f0c10 100644
--- a/trulens_eval/examples/expositional/end2end_apps/trubot/webindex.ipynb
+++ b/trulens_eval/examples/expositional/end2end_apps/trubot/webindex.ipynb
@@ -10,7 +10,7 @@
     "## Additional requirements:\n",
     "\n",
     "```bash\n",
-    "pip install humanize pdfreader url_normalize tabulate unstructured\n",
+    "pip install humanize pdfreader url_normalize tabulate unstructured langchain_community\n",
     "```"
    ]
   },
@@ -20,7 +20,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "# ! pip install humanize pdfreader url_normalize tabulate unstructured"
+    "# ! pip install humanize pdfreader url_normalize tabulate unstructured langchain_community"
    ]
   },
   {
diff --git a/trulens_eval/examples/expositional/frameworks/langchain/langchain_groundtruth.ipynb b/trulens_eval/examples/expositional/frameworks/langchain/langchain_groundtruth.ipynb
index 88ee0119e..bcd2794b9 100644
--- a/trulens_eval/examples/expositional/frameworks/langchain/langchain_groundtruth.ipynb
+++ b/trulens_eval/examples/expositional/frameworks/langchain/langchain_groundtruth.ipynb
@@ -19,7 +19,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "### Import from LlamaIndex and TruLens"
+    "### Import from _LangChain_ and TruLens"
    ]
   },
   {
@@ -28,7 +28,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "# ! pip install trulens_eval==0.18.1 langchain>=0.0.342"
+    "# ! pip install trulens_eval==0.18.1 langchain>=0.0.342 langchain_community"
    ]
   },
   {
diff --git a/trulens_eval/examples/expositional/frameworks/langchain/langchain_model_comparison.ipynb b/trulens_eval/examples/expositional/frameworks/langchain/langchain_model_comparison.ipynb
index 731ef6d73..1926cd03d 100644
--- a/trulens_eval/examples/expositional/frameworks/langchain/langchain_model_comparison.ipynb
+++ b/trulens_eval/examples/expositional/frameworks/langchain/langchain_model_comparison.ipynb
@@ -28,7 +28,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "# ! pip install trulens_eval==0.11.0 langchain==0.0.283"
+    "# ! pip install trulens_eval==0.11.0 langchain==0.0.283 langchain_community"
    ]
   },
   {
diff --git a/trulens_eval/examples/expositional/frameworks/langchain/langchain_summarize.ipynb b/trulens_eval/examples/expositional/frameworks/langchain/langchain_summarize.ipynb
index 7c451eb3c..6e3b865b7 100644
--- a/trulens_eval/examples/expositional/frameworks/langchain/langchain_summarize.ipynb
+++ b/trulens_eval/examples/expositional/frameworks/langchain/langchain_summarize.ipynb
@@ -26,7 +26,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "# ! pip install trulens_eval==0.11.0 langchain==0.0.283"
+    "# ! pip install trulens_eval==0.11.0 langchain==0.0.283 langchain_community"
    ]
   },
   {
diff --git a/trulens_eval/examples/expositional/models/Vectara_HHEM_evaluator.ipynb b/trulens_eval/examples/expositional/models/Vectara_HHEM_evaluator.ipynb
index bcb7a9387..12d527d25 100644
--- a/trulens_eval/examples/expositional/models/Vectara_HHEM_evaluator.ipynb
+++ b/trulens_eval/examples/expositional/models/Vectara_HHEM_evaluator.ipynb
@@ -33,7 +33,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "#!pip install langchain==0.0.354 ,langchain-community==0.0.20 ,langchain-core==0.1.23,trulens_eval"
+    "#!pip install 'langchain==0.0.354' 'langchain-community==0.0.20' 'langchain-core==0.1.23' 'trulens_eval'"
    ]
   },
   {
diff --git a/trulens_eval/examples/expositional/use_cases/pii_detection.ipynb b/trulens_eval/examples/expositional/use_cases/pii_detection.ipynb
index c40271a7e..f209da7b1 100644
--- a/trulens_eval/examples/expositional/use_cases/pii_detection.ipynb
+++ b/trulens_eval/examples/expositional/use_cases/pii_detection.ipynb
@@ -18,7 +18,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "# ! pip install trulens_eval==0.14.0 langchain>=0.0.263"
+    "# ! pip install 'trulens_eval==0.14.0' 'langchain>=0.0.263' langchain_community"
    ]
   },
   {
diff --git a/trulens_eval/examples/expositional/vector-dbs/pinecone/pinecone_evals_build_better_rags.ipynb b/trulens_eval/examples/expositional/vector-dbs/pinecone/pinecone_evals_build_better_rags.ipynb
index f49c90918..751405b72 100644
--- a/trulens_eval/examples/expositional/vector-dbs/pinecone/pinecone_evals_build_better_rags.ipynb
+++ b/trulens_eval/examples/expositional/vector-dbs/pinecone/pinecone_evals_build_better_rags.ipynb
@@ -41,7 +41,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "!pip install -qU trulens-eval==0.16.0 langchain==0.0.315 openai==0.28.1 tiktoken==0.5.1 \"pinecone-client[grpc]==2.2.4\" pinecone-datasets==0.5.1 datasets==2.14.5"
+    "!pip install -qU trulens-eval==0.16.0 langchain==0.0.315 openai==0.28.1 tiktoken==0.5.1 \"pinecone-client[grpc]==2.2.4\" pinecone-datasets==0.5.1 datasets==2.14.5 langchain_community"
    ]
   },
   {
diff --git a/trulens_eval/examples/quickstart/langchain_quickstart.ipynb b/trulens_eval/examples/quickstart/langchain_quickstart.ipynb
index 58cafe9a4..b717c5c23 100644
--- a/trulens_eval/examples/quickstart/langchain_quickstart.ipynb
+++ b/trulens_eval/examples/quickstart/langchain_quickstart.ipynb
@@ -28,7 +28,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "# ! pip install trulens_eval openai langchain langchain-openai faiss-cpu bs4 tiktoken"
+    "# ! pip install trulens_eval openai langchain langchain-openai langchain_community faiss-cpu bs4 tiktoken"
    ]
   },
   {
@@ -434,7 +434,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.10.14"
+   "version": "3.12.3"
   },
   "vscode": {
    "interpreter": {
diff --git a/trulens_eval/trulens_eval/Example_TruBot.py b/trulens_eval/trulens_eval/Example_TruBot.py
index 914ce29b2..a090bf271 100644
--- a/trulens_eval/trulens_eval/Example_TruBot.py
+++ b/trulens_eval/trulens_eval/Example_TruBot.py
@@ -3,11 +3,8 @@
 os.environ['PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION'] = 'python'
 
 from langchain.chains import ConversationalRetrievalChain
-from langchain.embeddings.openai import OpenAIEmbeddings
 from langchain.memory import ConversationSummaryBufferMemory
-from langchain_community.callbacks import get_openai_callback
-from langchain_community.llms import OpenAI
-from langchain_community.vectorstores import Pinecone
+
 import numpy as np
 import streamlit as st
 
@@ -22,8 +19,14 @@
 
 with OptionalImports(messages=REQUIREMENT_PINECONE):
     import pinecone
+    import langchain_community
+    from langchain_community.callbacks import get_openai_callback
+    from langchain_community.llms import OpenAI
+    from langchain.embeddings.openai import OpenAIEmbeddings
 
-OptionalImports(messages=REQUIREMENT_PINECONE).assert_installed(pinecone)
+OptionalImports(messages=REQUIREMENT_PINECONE).assert_installed(
+    mods=[pinecone, langchain_community, OpenAIEmbeddings]
+)
 
 check_keys("OPENAI_API_KEY", "PINECONE_API_KEY", "PINECONE_ENV")
 
diff --git a/trulens_eval/trulens_eval/feedback/provider/endpoint/openai.py b/trulens_eval/trulens_eval/feedback/provider/endpoint/openai.py
index 5918271d5..677f84d55 100644
--- a/trulens_eval/trulens_eval/feedback/provider/endpoint/openai.py
+++ b/trulens_eval/trulens_eval/feedback/provider/endpoint/openai.py
@@ -25,7 +25,6 @@
 import pprint
 from typing import Any, Callable, ClassVar, Dict, List, Optional, Union
 
-from langchain.callbacks.openai_info import OpenAICallbackHandler
 from langchain.schema import Generation
 from langchain.schema import LLMResult
 import pydantic
@@ -44,8 +43,13 @@
 with OptionalImports(messages=REQUIREMENT_OPENAI):
     import openai as oai
 
-# check that oai is not a dummy:
-OptionalImports(messages=REQUIREMENT_OPENAI).assert_installed(oai)
+    # This is also required for running openai endpoints in trulens_eval:
+    from langchain.callbacks.openai_info import OpenAICallbackHandler
+
+# check that oai is not a dummy, also the langchain component required for handling openai endpoint
+OptionalImports(messages=REQUIREMENT_OPENAI).assert_installed(
+    mods=[oai, OpenAICallbackHandler]
+)
 
 logger = logging.getLogger(__name__)
 
diff --git a/trulens_eval/trulens_eval/requirements.optional.txt b/trulens_eval/trulens_eval/requirements.optional.txt
index 39eb9c0cb..11aa51561 100644
--- a/trulens_eval/trulens_eval/requirements.optional.txt
+++ b/trulens_eval/trulens_eval/requirements.optional.txt
@@ -9,7 +9,7 @@ evaluate     >= 0.4.0  # same
 
 # Apps: LangChain (optional parts)
 langchainhub        >= 0.1.14  # example notebooks
-langchain_community >= 0.0.17  # example notebooks, now required for Pinecone, others
+langchain_community >= 0.0.17  # example notebooks, openai endpoint, now required for Pinecone, others
 langchain_openai    >= 0.0.5  # unit tests, sample apps
 
 # Apps: LlamaIndex
diff --git a/trulens_eval/trulens_eval/utils/imports.py b/trulens_eval/trulens_eval/utils/imports.py
index 6fd7421b4..e378a1d2e 100644
--- a/trulens_eval/trulens_eval/utils/imports.py
+++ b/trulens_eval/trulens_eval/utils/imports.py
@@ -13,14 +13,13 @@
 from pathlib import Path
 from pprint import PrettyPrinter
 import sys
-from typing import Any, Dict, Optional, Sequence, Type, Union
+from typing import Any, Dict, Iterable, Optional, Sequence, Type, Union
 
 from packaging import requirements
 from packaging import version
 from pip._internal.req import parse_requirements
 
 from trulens_eval import __name__ as trulens_name
-from trulens_eval.utils.text import retab
 
 logger = logging.getLogger(__name__)
 pp = PrettyPrinter()
@@ -338,7 +337,7 @@ def format_import_errors(
 
 REQUIREMENT_PINECONE = format_import_errors(
     # package name is "pinecone-client" but module is "pinecone"
-    'pinecone-client',
+    ['pinecone-client', 'langchain_community'],
     purpose="running TruBot"
 )
 
@@ -355,7 +354,7 @@ def format_import_errors(
 )
 
 REQUIREMENT_OPENAI = format_import_errors(
-    'openai', purpose="using OpenAI models"
+    ['openai', 'langchain_community'], purpose="using OpenAI models"
 )
 
 REQUIREMENT_GROUNDEDNESS = format_import_errors(
@@ -445,7 +444,7 @@ def __init__(self, name: str, *args, **kwargs):
         self.original_exception = original_exception
 
     def __call__(self, *args, **kwargs):
-        raise self.exception_class(self.message)
+        raise self.exception_class(self.message) from self.original_exception
 
     def __instancecheck__(self, __instance: Any) -> bool:
         """Nothing is an instance of this dummy.
@@ -463,7 +462,7 @@ def __subclasscheck__(self, __subclass: type) -> bool:
         return False
 
     def _wasused(self, *args, **kwargs):
-        raise self.exception_class(self.message)
+        raise self.exception_class(self.message) from self.original_exception
 
     # If someone tries to use dummy in an expression, raise our usage exception:
     __add__ = _wasused
@@ -536,12 +535,15 @@ class OptionalImports(object):
         specified message (unless llama_index is installed of course).
     """
 
-    def assert_installed(self, mod):
+    def assert_installed(self, mods: Union[Any, Iterable[Any]]):
         """
-        Check that the given module `mod` is not a dummy. If it is, show the
+        Check that the given modules `mods` are not dummies. If any is, show the
         optional requirement message.
         """
-        if isinstance(mod, Dummy):
+        if not isinstance(mods, Iterable):
+            mods = [mods]
+
+        if any(isinstance(mod, Dummy) for mod in mods):
             raise ModuleNotFoundError(self.messages.module_not_found)
 
     def __init__(self, messages: ImportErrorMessages, fail: bool = False):
@@ -659,9 +661,7 @@ def __exit__(self, exc_type, exc_value, exc_tb):
                 raise exc_value
 
             raise ModuleNotFoundError(
-                self.messages.module_not_found +
-                "\nError that caused this problem:\n\n" +
-                retab(tab="    ", s=repr(exc_value))
+                self.messages.module_not_found
             ) from exc_value
 
         elif isinstance(exc_value, ImportError):
@@ -670,9 +670,7 @@ def __exit__(self, exc_type, exc_value, exc_tb):
                 raise exc_value
 
             raise ImportError(
-                self.messages.import_error +
-                "\nError that caused this problem:\n\n" +
-                retab(tab="    ", s=repr(exc_value))
+                self.messages.import_error
             ) from exc_value
 
         # Exception will be propagated unless we return True so we don't return it.