CMS Made Simple Forums

Like mentioned in another post, I am developing an own module.

Everything worked fine, but now I want to upgrade my productive system: on my test-infrastructure, I export the module and import it as XML.
On two of three productive systems (where I have no shell/sftp-access), I get this
"Error parsing XML file. Please make sure you are uploading a .xml file and not a .tar.gz or zip file. (Troubleshooting)"

I cannot image, where I have made the mistake. Any clue - idea for the next error-searching steps?

br and thanks in advance

Somehow, I get the impression, that this Problem is caused by the PHP xml_parse_into_struct()-function, but why? The libxml is probably not the problem, I have 2.6.26 and 2.6.31, both correctly importing the xml-file, the other productive systems have 2.6.27 and are not importing

No one with the same problems?