In blog settings/widgets admin page. b2evolution 2.1.0-beta

This is the URL which give me the following error

http://<site>.com/admin.php?ctrl=widgets&action=delete&wi_ID=43?ctrl=widgets&blog=4

Bad Request!

The parameters of your request are invalid.

If you have obtained this error by clicking on a link INSIDE of this site, please report the bad link to the administrator.

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Additional information about this error:

Illegal value received for parameter «wi_ID»!