sorry for my short message. Also if I try to install over the plugin manager, I get the error, "something went wrong". I asked Atlassian support they told me they had the same problem with this.
That's great, the instance looks in good shape now.
I saw in the logs you're trying to install: [projectdoc Core Blueprints | Atlassian Marketplace|https://marketplace.atlassian.com/plugins/de.smartics.atlassian.confluence.smartics-projectdoc-confluence-space-core/server/overview]
I tried this myself in 5.9.7 and got the same failure and errors in the logs. This seems to be an issue with the add-on itself, not your system. You'd need to contact the developers here:https://answers.atlassian.com/questions/topics/9011221/addon-de.smartics.atlassian.confluence.smartic for further info.
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