This kind of error will occur in crystal report when you export the report to any other format. For example from “.rpt” to “.pdf” /”.doc” like that. The error message will be like this

Problem:

Invalid export DLL or Export Format

Cause /Reason:
The problem is in the export dll used in the crystal report.. since its not properly registered this problem will occur

Solution:
Uninstall the acrobat reader and reinstall it this problem will be solved