diff --git a/Exareme-Docker/files/root/exareme/convert-csv-dataset-to-db.py b/Exareme-Docker/files/root/exareme/convert-csv-dataset-to-db.py
index 9bffa3fb6..4ad341440 100755
--- a/Exareme-Docker/files/root/exareme/convert-csv-dataset-to-db.py
+++ b/Exareme-Docker/files/root/exareme/convert-csv-dataset-to-db.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 """
diff --git a/Exareme-Docker/src/exareme/exareme-master/src/main/java/madgik/exareme/master/gateway/async/handler/HBP/Exceptions/RequestException.java b/Exareme-Docker/src/exareme/exareme-master/src/main/java/madgik/exareme/master/gateway/async/handler/HBP/Exceptions/RequestException.java
new file mode 100644
index 000000000..cecd101d1
--- /dev/null
+++ b/Exareme-Docker/src/exareme/exareme-master/src/main/java/madgik/exareme/master/gateway/async/handler/HBP/Exceptions/RequestException.java
@@ -0,0 +1,7 @@
+package madgik.exareme.master.gateway.async.handler.HBP.Exceptions;
+
+public class RequestException extends Exception {
+    public RequestException(String algorithmName, String message) {
+        super(message + "  Algorithm: " + algorithmName);
+    }
+}
\ No newline at end of file
diff --git a/Exareme-Docker/src/exareme/exareme-master/src/main/java/madgik/exareme/master/gateway/async/handler/HBP/HBPQueryHandler.java b/Exareme-Docker/src/exareme/exareme-master/src/main/java/madgik/exareme/master/gateway/async/handler/HBP/HBPQueryHandler.java
index bbc7c6b95..e48228f53 100644
--- a/Exareme-Docker/src/exareme/exareme-master/src/main/java/madgik/exareme/master/gateway/async/handler/HBP/HBPQueryHandler.java
+++ b/Exareme-Docker/src/exareme/exareme-master/src/main/java/madgik/exareme/master/gateway/async/handler/HBP/HBPQueryHandler.java
@@ -1,6 +1,5 @@
 package madgik.exareme.master.gateway.async.handler.HBP;
 
-import com.google.gson.JsonSyntaxException;
 import madgik.exareme.common.consts.HBPConstants;
 import madgik.exareme.master.client.AdpDBClient;
 import madgik.exareme.master.client.AdpDBClientFactory;
@@ -14,12 +13,12 @@
 import madgik.exareme.master.engine.iterations.handler.NIterativeAlgorithmResultEntity;
 import madgik.exareme.master.engine.iterations.state.IterativeAlgorithmState;
 import madgik.exareme.master.gateway.ExaremeGatewayUtils;
+import madgik.exareme.master.gateway.async.handler.HBP.Exceptions.RequestException;
 import madgik.exareme.master.gateway.async.handler.HBP.Exceptions.UserException;
 import madgik.exareme.master.gateway.async.handler.entity.NQueryResultEntity;
 import madgik.exareme.master.queryProcessor.HBP.AlgorithmProperties;
 import madgik.exareme.master.queryProcessor.HBP.Algorithms;
 import madgik.exareme.master.queryProcessor.HBP.Composer;
-import madgik.exareme.master.queryProcessor.HBP.Exceptions.AlgorithmException;
 import madgik.exareme.worker.art.container.ContainerProxy;
 import org.apache.http.*;
 import org.apache.http.entity.BasicHttpEntity;
@@ -100,9 +99,14 @@ private void handleHBPAlgorithmExecution(HttpRequest request, HttpResponse respo
             preExecutionChecks(request);
 
             String algorithmName = getAlgorithmName(request);
+            AlgorithmProperties algorithmProperties = Algorithms.getInstance().getAlgorithmProperties(algorithmName);
+            if (algorithmProperties == null)
+                throw new RequestException(algorithmName, "The algorithm '" + algorithmName + "' does not exist.");
+
             String algorithmKey = algorithmName + "_" + System.currentTimeMillis();
-            log.info("Executing algorithm: " + algorithmName + " with key: " + algorithmKey);
 
+            // Logging the algorithm execution parameters
+            log.info("Executing algorithm: " + algorithmName + " with key: " + algorithmKey);
             HashMap<String, String> algorithmParameters = HBPQueryHelper.getAlgorithmParameters(request);
             log.info("Request for algorithm: " + algorithmName);
             if (algorithmParameters != null) {
@@ -114,10 +118,6 @@ private void handleHBPAlgorithmExecution(HttpRequest request, HttpResponse respo
 
             AdpDBClientQueryStatus queryStatus;
 
-            AlgorithmProperties algorithmProperties = Algorithms.getInstance().getAlgorithmProperties(algorithmName);
-            if (algorithmProperties == null)
-                throw new AlgorithmException(algorithmName, "The algorithm '" + algorithmName + "' does not exist.");
-
             algorithmProperties.mergeWithAlgorithmParameters(algorithmParameters);
 
             DataSerialization ds = DataSerialization.summary;
@@ -167,27 +167,27 @@ private void handleHBPAlgorithmExecution(HttpRequest request, HttpResponse respo
                 response.setStatusCode(HttpStatus.SC_OK);
                 response.setEntity(entity);
             }
-        } catch (IterationsFatalException e) {
-            log.error(e);
-            if (e.getErroneousAlgorithmKey() != null)
-                iterationsHandler.removeIterativeAlgorithmStateInstanceFromISM(
-                        e.getErroneousAlgorithmKey());
-            log.error(e);
-            String errorType = HBPQueryHelper.ErrorResponse.ErrorResponseTypes.error;
-            response.setStatusCode(HttpStatus.SC_BAD_REQUEST);
+        } catch (UserException e) {
+            log.error(e.getMessage());
+            String errorType = HBPQueryHelper.ErrorResponse.ErrorResponseTypes.user_error;
+            response.setStatusCode(HttpStatus.SC_OK);
             response.setEntity(createErrorResponseEntity(e.getMessage(), errorType));
 
-        } catch (UserException e) {
+        } catch (RequestException e) {
             log.error(e.getMessage());
             String errorType = HBPQueryHelper.ErrorResponse.ErrorResponseTypes.user_error;
             response.setStatusCode(HttpStatus.SC_BAD_REQUEST);
             response.setEntity(createErrorResponseEntity(e.getMessage(), errorType));
 
-        } catch (JsonSyntaxException e) {
-            log.error("Could not parse the algorithms properly.");
+        } catch (IterationsFatalException e) {
+            log.error(e);
+            if (e.getErroneousAlgorithmKey() != null)
+                iterationsHandler.removeIterativeAlgorithmStateInstanceFromISM(
+                        e.getErroneousAlgorithmKey());
+            log.error(e);
             String errorType = HBPQueryHelper.ErrorResponse.ErrorResponseTypes.error;
-            response.setStatusCode(HttpStatus.SC_BAD_REQUEST);
-            response.setEntity(createErrorResponseEntity(serverErrorOccurred, errorType));
+            response.setStatusCode(HttpStatus.SC_INTERNAL_SERVER_ERROR);
+            response.setEntity(createErrorResponseEntity(e.getMessage(), errorType));
 
         } catch (Exception e) {
             log.error(e.getMessage());
@@ -197,7 +197,7 @@ private void handleHBPAlgorithmExecution(HttpRequest request, HttpResponse respo
             }
             log.error(e.getStackTrace());
             String errorType = HBPQueryHelper.ErrorResponse.ErrorResponseTypes.error;
-            response.setStatusCode(HttpStatus.SC_BAD_REQUEST);
+            response.setStatusCode(HttpStatus.SC_INTERNAL_SERVER_ERROR);
             response.setEntity(createErrorResponseEntity(serverErrorOccurred, errorType));
         }
     }
diff --git a/Exareme-Docker/src/exareme/exareme-master/src/main/java/madgik/exareme/master/gateway/control/handler/HttpAsyncCheckWorker.java b/Exareme-Docker/src/exareme/exareme-master/src/main/java/madgik/exareme/master/gateway/control/handler/HttpAsyncCheckWorker.java
index d320049f9..5274c9f9e 100644
--- a/Exareme-Docker/src/exareme/exareme-master/src/main/java/madgik/exareme/master/gateway/control/handler/HttpAsyncCheckWorker.java
+++ b/Exareme-Docker/src/exareme/exareme-master/src/main/java/madgik/exareme/master/gateway/control/handler/HttpAsyncCheckWorker.java
@@ -9,6 +9,7 @@
 import madgik.exareme.master.engine.AdpDBManager;
 import madgik.exareme.master.engine.AdpDBManagerLocator;
 import madgik.exareme.master.gateway.ExaremeGatewayUtils;
+import madgik.exareme.master.gateway.async.handler.HBP.Exceptions.RequestException;
 import madgik.exareme.master.gateway.async.handler.HBP.Exceptions.UserException;
 import madgik.exareme.master.gateway.async.handler.entity.NQueryResultEntity;
 import madgik.exareme.master.queryProcessor.HBP.AlgorithmProperties;
@@ -54,7 +55,7 @@ public void handle(
         HttpResponse response = httpexchange.getResponse();
         try {
             handleInternal(request, response, context);
-        } catch (AlgorithmException | CDEsMetadataException | ComposerException | UserException e) {
+        } catch (AlgorithmException | CDEsMetadataException | ComposerException | UserException | RequestException e) {
             e.printStackTrace();
         }
         httpexchange.submitResponse(new BasicAsyncResponseProducer(response));
@@ -64,7 +65,7 @@ private void handleInternal(
             final HttpRequest request,
             final HttpResponse response,
             final HttpContext context
-    ) throws HttpException, IOException, AlgorithmException, CDEsMetadataException, ComposerException, UserException {
+    ) throws HttpException, IOException, AlgorithmException, CDEsMetadataException, ComposerException, UserException, RequestException {
 
         String method = request.getRequestLine().getMethod().toUpperCase(Locale.ENGLISH);
         if (!method.equals("GET") && !method.equals("HEAD") && !method.equals("POST")) {
@@ -87,7 +88,7 @@ private void handleInternal(
         AlgorithmProperties algorithmProperties = Algorithms.getInstance().getAlgorithmProperties(algorithmName);
 
         if (algorithmProperties == null)
-            throw new AlgorithmException(algorithmName, "The algorithm does not exist.");
+            throw new RequestException(algorithmName, "The algorithm does not exist.");
 
         algorithmProperties.mergeWithAlgorithmParameters(inputContent);