My b2evolution Version: Not Entered

Hi!
Im new at all this and i need a bit of help. Iam having problems with uploading some of my pictures. If I use the file manager I am able to post one picture at a time, but when I am using the 'write'-funktion and press 'files' there is some sort of problem. I dont anderstand what this means.
:oops:

* Found invalid URL: Invalid URL format (http://www.onlycim.com/bloggen/media/blogs/a/081123 270.jpg).
* (Note: To get rid of the above validation warnings, you can deactivate unwanted validation rules in your Group settings.)
* Invalid content.

Would really like some help..: :(