Warning Message – no error occurred – when using Dreamweaver

I was updating a page in Dreamweaver when I got this error or warning message.
It was a bit confusing though. So I went on updating but then I couldn’t save the page.
I tried to delete several drawings but still I couldn’t save the page.
Anyone who knows something about the problem?
Hope you can help.
Here's the warning message:

Error:
Macromedia Dreamweaver
No error occurred.
