DTD Version missing or incompatible in the XML file

[cyberman]

Which CMSms version do you are using?

Btw. there are differences between modules for 0.13 and 1.x.

You can try to download it to a local server (e.g. Xampp) with needed CMSms version to extract the files. Then you can  upload files via ftp.

[Dr.CSS]

Xstandard is ,simple, pared down, only has a few buttons, you have to know the path to images no browsing for them, but I do have it installed on CMSMS Ver. 1.0.2, did you try it in .zip...

It's from before 1.0, no updates in 3 months...

[cyberman]

But writes every time clean xhtml strict ! If you want more it's no problem to buy pro version .