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kaufman, lamp, you both should uninstall the plugins completely first (the following describes the procedure for iOS reader apps but it's similar for Marvin XD - if it smells like either, kill it):
- Go to Preferences | Advanced | Plugins | Device Interface plugins, select iOS reader applications.
- Click Remove plugin.
- Click Apply.
- Go to Preferences | Advanced | Miscellaneous, click Open calibre configuration directory.
- Open the plugins folder.
- Delete iOS reader applications.json.
- Delete the iOS_reader_applications_resources folder.
- Restart calibre.
Then try installing the plugin(s) again.
And please always state your operating system. And if there's a "Show details" button, it helps to click it and copy & paste the text. :-)
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