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I've been searching around for a solution to this for a few days, but haven't found anything yet... The content tree (as well as the media tree, developer tree, etc.) pane does not display on a site of ours (Umbraco 7.12.3, though I also tried copying the site & database and upgrading to 7.15.3 to see if that fixed it: it did not)
Console shows a 415 error on GET for /umbraco/backoffice/UmbracoTrees/ApplicationTree/GetApplicationTrees?application=content&tree=&isDialog=false
I've tried the dependency cache and deleting umbraco.settings to no avail.
Any ideas would be appreciated, Thanks!
Did you happen to also rebuild the Examine indexes?
There was an issue raised last year for a similar error message. The cause of it was the upgraded MVC 5 and WebApi nuget package to 5.2.7. But the fix was merged to Umbraco 7.14.
May this can help you: https://github.com/umbraco/Umbraco-CMS/issues/3796
Do you have quite a lot of nodes on the Umbraco installation? As we have seen this happen due to SQL timeout otherwise it works fine.
Are you facing this issue both locally and on the server?
Try restarting database server and Web server and then give it a go?
Rebuilding examine indexes didn't help. I did have a look at that issue on Github, that's where I was hoping the upgrade to 7.15.3 might have helped, but no luck. I also tried dropping down to an older version of WebAPI, no improvement.
I am facing the problem both locally and on the server. The servers have been rebooted since the problem began.
The number of nodes is quite low compared to some of our other sites.
I decided to try and reset to a previous commit in our project and that fixed the problem. I can't say for sure what caused it in the first place (which I don't particularly enjoy...), but at the very least we will be able to edit content once more.
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