Invoke Code: Exception has been thrown by the target of an invocation(Save the work file into pdf))

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Below is the input file. I think this is not the word file i guess.

This image shows a file explorer window with the path "C:sersarthikeyanocumentsiPathSACustomerService_DispatcheratanputailasPDF" displaying a single text document named "MailPDF" with a size of 67 KB and a modification date of January 30, 2025. (Captioned by AI)
This image shows a file explorer window with the path "C:sersarthikeyanocumentsiPathSACustomerService_DispatcheratanputailasPDF" displaying a single text document named "MailPDF" with a size of 67 KB and a modification date of January 30, 2025. (Captioned by AI)1220×247 8.88 KB

Note: This code is not developed by me. So little confused