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Sorry to hear that. Both modules worked for me and I am using an old version of XOOPS (2.0.5.2). Hopefully one of the PHP experts can help you with this.
Could be the result of corrupt PHP files?. Interrupted FTP upload is often a cause. You might want to check that there are no zero-byte files after uploading. Editing a PHP file online to change config settings (using CPANEL for example) can sometimes leave a trailing blank space after the closing PHP tag. This can also stop a file from executing.
Of course your host's PHP setup must meet the XOOPS spec regarding required PHP modules, register_globals and safe-mode settings - although I confess I don't know what these requirements are. Should be in a FAQ somewhere?.