clr20r3 crystal report

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i am developping a basic project on visual studio 2010.my projects is working and i can use it well. but there is a problem while i am closing it.i mean 1 if i add a "report.rpt" object to my project. i can use it. but while i am closing the project i am getting the "clr20r3" error. 2 if i donT add a "report.rpt" object there is no problem. even while i am closing the project. what could be de solution of this problem?