Plesk for Windows
Plesk for Linux
WordPress Toolkit
Symptoms
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Unable to update WordPress plugins via WordPress > example.com > Plugins > Update with error:
Update failed: -1
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Updating the WordPress plugin from WordPress admin dashboard also fails
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Unable to post or update posts via the WordPress admin dashboard
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The plugin Starter Templates is installed and enabled
Cause
Plugin Starter Templates has an issue on their patch notes that acknowledge this:
v3.1.26 – 22-February-2023 – Fix: Plugin installation from WordPress plugins dashboard fails when Starter Template is activated.
Resolution
- Log into Plesk
- Disable the Starter Templates plugin from WordPress > example.com > Plugins
- Update all plugins from WordPress > Plugins > select all plugins > Update
- Enable Starter Template plugin
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