Error:Failed to render page ..??

hi

i was using visual studio 2005 with crystal reports 2008, it was working fine

but now i changed crystal reports 2008 to crystal reports 10 with the same visual studio 2005

now i can access all the reports except charts, where ever i am using charts that reprots is not loading

into my aspx page it is giving below error but in my development server those reports also working after deploying

into server this problem occuring :

Crystal repor viewer - Crystal reports viewer1

Error:Failed to render page

Pls help me its urjent

Thanks

Venkat