Many files contain Onokazu's credits with references to the subdomain JP.XOOPS.ORG, but this no longer exists, was removed by the current foundation some days ago. I sent a email to Mamba and PHPPP, but without answer. Suggestion: replace it by "xoopscube.jp", or try to contact then again.
Feedback, please!
Because X2 files were written by the XOOPS developers, we have to include their name on the credit of old files. But, jp.xoops.org is not available now. So we have to replace this URL with xoopscube.jp or other.
After asking onokazu about this, I will change them.