Make sure that you (means the user who has logged in to the PC) have the modify/write access to the drive in which ur wM was installed. If you dont have sufficient privileges to modify/write onto this Drive on ur hard disk, then you can’t even save a change made to any of ur program file or install a new software or etc., on ur hard drive. So make sure that you have the full access control over the PC u r using.
After doing what was mentioned above, try clicking in Dev window. You will not probably see the error popping up again. For more info refer this link “http://www.wmusers.com/forum/showthread.php?t=13272&highlight=%5BITU.0001.0003%5D”
HTH
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