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System.NullReferenceException: Object reference not set to an instance of an object. PDF Merge

Hi everyone.


Need help with this. Tried to search, some solutions also came up but nothing is working for me. 


Robin.Core.ActionException: Failed to merge PDF files: 'E:\OneDrive\medical claim\Medical Bill A\1.4.pdf', 'E:\OneDrive\medical claim\Medical Bill A\1.3.pdf', 'E:\OneDrive\medical claim\Medical Bill A\1.2.pdf', 'E:\OneDrive\medical claim\Medical Bill A\1.1.pdf', 'E:\OneDrive\medical claim\Medical Bill A\1.0.pdf', 'E:\OneDrive\medical claim\Medical Bill A\0.0.pdf' ---> System.NullReferenceException: Object reference not set to an instance of an object.
at Robin.Modules.PDF.Actions.PDFium.PDFium.FPDF_SaveAsCopy(IntPtr doc, FPDF_FILEWRITE writer, Int32 flags)
at Robin.Modules.PDF.Actions.MergePDFFilesAction.Execute(ActionContext context)
--- End of inner exception stack trace ---
at Robin.Modules.PDF.Actions.MergePDFFilesAction.Execute(ActionContext context)
at Robin.Runtime.Engine.ActionRunner.RunAction(String action, Dictionary`2 inputArguments, Dictionary`2 outputArguments, IActionStatement statement)





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I'm having the exact same problem, any luck?

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