Fix symforce codegen ValueError error message #485

Job	Run time
test-on-ubuntu (ubuntu-20.04, 3.8, gcc-11, g++-11, g++-11, "ppa:ubuntu-toolchain-r/test", OFF)	34m 41s
test-on-ubuntu (ubuntu-20.04, 3.9, gcc-11, g++-11, g++-11, "ppa:ubuntu-toolchain-r/test", OFF)	35m 48s
test-on-ubuntu (ubuntu-20.04, 3.10, gcc-11, g++-11, g++-11, "ppa:ubuntu-toolchain-r/test", OFF)	35m 42s
test-on-ubuntu (ubuntu-20.04, 3.11, gcc-11, g++-11, g++-11, "ppa:ubuntu-toolchain-r/test", OFF)	32m 59s
test-on-ubuntu (ubuntu-20.04, 3.12, gcc-11, g++-11, g++-11, "ppa:ubuntu-toolchain-r/test", OFF)	34m 1s
test-on-ubuntu (ubuntu-22.04, 3.8, gcc-11, g++-11, g++-11, "ppa:ubuntu-toolchain-r/test", OFF)	35m 10s
test-on-ubuntu (ubuntu-22.04, 3.9, gcc-11, g++-11, g++-11, "ppa:ubuntu-toolchain-r/test", OFF)	37m 27s
test-on-ubuntu (ubuntu-22.04, 3.10, gcc-11, g++-11, g++-11, "ppa:ubuntu-toolchain-r/test", OFF)	36m 2s
test-on-ubuntu (ubuntu-22.04, 3.11, gcc-11, g++-11, g++-11, "ppa:ubuntu-toolchain-r/test", OFF)	32m 40s
test-on-ubuntu (ubuntu-22.04, 3.12, gcc-11, g++-11, g++-11, "ppa:ubuntu-toolchain-r/test", OFF)	33m 37s
test-on-ubuntu (ubuntu-20.04, 3.8, gcc-5, g++-5, g++-5, "deb http://us.archive.ubuntu.com/ubuntu/...	33m 22s
test-on-ubuntu (ubuntu-20.04, 3.8, clang-7, clang++-7, clang-7, ON)	34m 2s
test-on-ubuntu (ubuntu-22.04, 3.10, clang-15, clang++-15, clang-15, OFF)	35m 43s
	7h 31m 14s

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