Alright, so if you're seeing the error 'Failed to create the part's controls in Eclipse with Salesforce,' here's what you can try to fix it:
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First, try restarting Eclipse – Sometimes, a quick restart is all it takes to reset things.
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Check for any plugin updates – Go to your Eclipse marketplace or update manager and make sure your Salesforce plugins and other related plugins are fully updated.
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Double-check your Java version – Some Salesforce tools are picky about which version of Java is running, so make sure you're using the correct one for your setup according to the system.
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Reinstall the Salesforce plugin – If it's still acting up, try uninstalling and reinstalling the Salesforce plugin. This often fixes any configuration hiccups.
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Clear the Eclipse cache. Finally, go to Project > Clean… and select to rebuild the project, which can resolve any lingering issues.
Try these steps, and you should be set! Let me know if you run into any more trouble. You can learn more about Salesforce here.