Umbraco 13.8.1 update error

Questions
,
1

Hello, the reason for the vulnerability is that I am updating my project to 13.8.1 but I am following.

Error during installation

See the log for full details (logs can typically be found in the umbraco\Logs folder).

When I checked the network, I saw that it gave this error:

/install/api/PostPerformInstall/

415 Unsupported Media Type

)]}',{“Type”:“RFC 9110 - HTTP Semantics Media Type”,“Status”:415,“Detail”:null,“Instance”:null,“Extensions”:{“traceId”:“00-84cad6148ab69b0aedb17214018abf6e-43eabfaa073862a3-00”}}

What is the reason for this?

2

What is the version from which you were updating? We’ve updated a lot of projects to 13.8.1, but I haven’t seen this yet.

3

We are updating from 13.4.1

4

This seems to indicate JSON problems. I would suspect that you’ve globally overridden the settings for Newtonsoft JSON and that’s now giving you problems.

5

What I would try:

  • Install a completely clean Umbraco 13.4.1
  • Attach a backup of your database from this site to this clean install
  • Upgrade this clean install, attached to your database

That should work, if it still gives you this error then you have some more obscure problem on your machine.

After the upgrade succeeds, you can attach your backed up database to your current website again, which you already moved to 13.8.1. With the database also being on 13.8.1 you wouldn’t see the upgrade installer and hence not this error.