Hi,
I'm not sure, that is a funky error, makes me think some files are missing from the /bin folder, if you are doing a new installation, I recommend using the latest mojoPortal 2.3.5.5
Make sure you use a robust ftp client like FileZilla to upload the files and watch for any transfer errors and retry any failed transfers until they all make it.
If you have any problems with the latest release let us know.
Best,
Joe