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It is possible that you have corrupted the file /modules_v3/simpl_research/module.php Try replacing it with the original from the download.

This can easily happen if you use certain text editors. They insert a “byte order mark” (bom) invisibly at the start of the file, which breaks php.That would cause an error code 500.

Out of interest, what site did you try to create a research plugin for?

Nigel
My personal kiwitrees site is www.our-families.info