Error "Could not open a temporary file. Make sure to close unused documents." when add watermark.

Problem reported by maipendek naja - 7/1/2019 at 8:25 AM

Submitted

Hi,
I try to add the watermark in Document Viewer but always get the error message as below. How can I check or investigate this? Thank you.

Note: I use it on SharePoint 2016 on premise.

Exception:

Message: Could not open a temporary file. Make sure to close unused documents.

Conditional expression: m_stream != NULL

Version : 3.0.0

Filename : TempFile.cpp

Function : trn::SDF::TempFile::OpenTempFile

Linenumber : 142

Cem Alacayir Replied

Employee Post

Hi,

This seems to be a writing permission problem on the temporary folder.

Add the IUSR, Network Service (and your other Windows accounts which your app pool uses) to IIS_IUSRS group
Run iisreset in Administrator Command Prompt so that the change takes in effect.

This will grant permissions to “Temporary ASP.NET Files” folder as IIS_IUSRS group already has access to it.

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