When I was previewing the test.pdf file in the attachment on Win10 bool ret = ProcessExisting(bitmap ?? CanvasBitmap, page, pageRect, pageRotate, renderFlags); An unprocessed exception occurred at 0x000007FFA35E0E848 (pdfium. dll) (in JVviewer. exe): A critical program exit was requested. But when previewing the test. pdf file under Win7 or WinXP, it runs normally. Please help me analyze and solve the problem.