I had to upgrade the report server used by some application from SSRS 2014 to SSRS 2016.
I did the migration manually, because the old and new SSRS were installed on different machines, and I could not do an in-place update.
So the approach was (long story short):
- backup ReportServer on SSRS 2014
- install SSRS 2016 on new server
- restore ReportServer database
- update its structure to match SSRS 2016; I used Sql Compare to get structure from an in-purpose, empty ReportServer database created by SSRS 2016
- added record in ServerUpgradeHistory with version for SSRS 2016 (173)
- restored the Encryption keys from SSRS 2014.
Everything works ok, with one small issue.
When I try to open SSRS Web Portal URL (http://...myServer.../Reports), or to refresh main page, I get the following error popup.
This error doesn't appear to affect the functionality of SSRS - all reports work just fine. Also it does's appear when opening Web Service URL (http://...myServer.../ReportServer).
So it's just annoying so far.
I searched for the guid string in Catalog table (I thought it might be some folder name or something), but I found nothing.
Does anyone have any idea where it comes from and how to get rid of it?
Thank you
Edit
Recently I updated from SSRS 2016 to 2017, and I kept carrying this error with me. However I found the offending item. It is in Catalog table, and it is of Type = 3 (Resource), with mime-type application/octet-stream
I deleted it from catalog (I did a backup of it into a separate table - catalog_bak), but I still get the error when I load main page in (/reports)
Beside that, it never pops-up again, with one exception: it always shows-up when I access Site Settings -> Branding
I guess it has something to do with branding packages. Does anyone knows where are they stored, and how can I uninstall / clean-up that?
A Branding Package is created by a user. If the original package can't be found or is corrupted it should revert to the default. Have you tried removing the package or creating and uploading a new one? Also, try downloading SQL Server Mobile Report Publisher (https://www.microsoft.com/en-us/download/details.aspx?id=50400) and then connect your server with it. It may contain a theme that was used on your original server.