The problem is that you Title field is longer than 256 characters, or you are using characters, other than the latin once. Since non-standard symbols are represented as UTF-8 characters, each symbol is defined with 6 symbols. This way, you can easily reach the 256 limit. Here is what I suggest you:
- using shorter title
- define a new meta field for your Generic Content module. This metafield will represent your Title from now on, it will have the LongText type. Then, you can use the original Title field for your URL compliant title - just a short information about your content. Please take a look at the User Manual for more information on adding meta fields.
I hope this helps.
the Telerik team
, the state of the art learning tool for Telerik products.