./loopyMod: error while loading shared libraries: libstdc++.so.5: wrong ELF class: EL

[mrityunjay2]

i have installed library "libstdc++5_3.3.6-20~lucid1_amd64" intu my system. and
i have installed loopy and loopbuilder into my laptop, but loopy is running whlie when want to run LoopBuilder it said
"./loopyMod: error while loading shared libraries: libstdc++.so.5: wrong ELF class: EL"

[ubfan1]

Looks like you cut off the error message, if the wrong class was ELFCLASS64. You are probably on a 32 bit machine and need the i386 package. Try installing the package again with ":i386" appended to the name.