My b2evolution Version: Not Entered

Hi, I installed b2evolution 2.4.5 and was working on the blog layout adding and deleting widget but every time I delete a widget I get the error message below. I also get this message when installing a new skin.

At first I thought this was a installation problem so I deleted all the files, deleted the database and then started all over again. Creating a new database and re-installing b2evolution. But this didn't fix the problem.

Is this a bug ore something I'm doing wrong.

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Additional information about this error:
Illegal value received for parameter «wi_ID»!