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Symptoms This error is seen while importing the sth module via python   Error snippet: Error Occurred while loading the Spirent Automation Internal Utility Library (couldn't load file "/auto/tftp-blr-users4/kivenka2/Spirent_TestCenter_4.90/Spirent_TestCenter_Application_Linux/libsTcl.so": /auto/tftp-blr-users4/kivenka2/Spirent_TestCenter_4.90/Spirent_TestCenter_Application_Linux/libsTcl.so: wrong ELF class: ELFCLASS64). Environment Spirent TestCenter Automation-HLTAPI for python Linux 64-bit   Explanation/Resolution We see this error "wrong ELF class: ELFCLASS64" when the installed Python is of 32 bit and STC package is 64 bit Please install 32 bit STC package as the 32 bit Python has been already installed   Root Cause There is a version mismatch between python and STC package