Date: 2014jan16 Language: perl Q. How can I fix this error: /usr/bin/perl: symbol lookup error: ../lib/auto/Crypt/Rijndael/Rijndael.so: undefined symbol: Perl_Tstack_sp_ptr A. Its probably caused by the use of a Perl that was compiled for another version of Perl that what's installed. So recompile (and reinstall) the module.