Unable to cast COM object of type 'CrystalDecisions.ReportAppServer.Controllers.ReportSourceClass'
问题 I have 2 windows program. Program A : create with visual studio 2015 with crystal report SP18 Program B : create with visual studio 2017 with crystal report SP22 I have a computer with crystal report runtime SP 18. I run program A in that computer. Program A can create report. I run program B in that computer. Program B cannot create report. So, i upgrade the crystal report runtime to SP22. The result is Program B can create report. Now the problem is Program A cannot create report after the