Portal for ArcGIS - Failed to import site. A JSONObject text must begin with '{' at character 0 of

[Oiligriv]

Hello Community
I am restoring a Portal that has been damaged due to running out of disk space.
I have recovered the content and the DB and I am performing the restore.
the restore stops with the following error
Failed to import site. A JSONObject text must begin with '{' at character 0 of

do you have any ideas?

[MattMoore]

Did you ever find a solution to this? Have a customer that came across the same issue. 

[CodeSpatial]

I have a similar issue but happens during webgisdr export and also while trying to export the site form AGS admin endpoint.

Export operation failed. A JSONObject text must begin with '{' at character 1 of