exception has been thrown by the target of an invocation error while updating picture in user Profile

Hi,

I am working on updating picture of user profile in sharepoint 2013.

I am getting error "exception has been thrown by the target of an invocation" while creating Thumbnail at the below line.

"file = (SPFile)mi_CreateThumbnail.Invoke(null, new object[] { original, idealWidth, idealHeight, folder, fileName, null });"

I have added SPUtility.ValidateFormDigest() before calling this method. but no luck.

Please help me on this.

Thanks

Hareesh