==============================
*** Open Babel Error in FullConvert
Cannot write to /home/est863/mysites/ChemToolsWebService/calcore/formopac/C(=C#c1ccccc1)()#c1ccccc1/C(=C#c1ccccc1)()#c1ccccc1.mop
0 molecules converted
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*** Open Babel Error in FullConvert
==============================
*** Open Babel Error in FullConvert
Cannot write to /home/est863/mysites/ChemToolsWebService/calcore/formopac/C(=C#c1ccccc1)()#c1ccccc1/C(=C#c1ccccc1)()#c1ccccc1.mop
0 molecules converted
Looks like a file permissions problem. Nothing to do with Open Babel.