To resolve the "Photoshop Error 21 Undefined Is Not an Object," start by uninstalling the Creative Cloud Desktop application and renaming specific Adobe folders. Follow this up with a fresh installation of Adobe Creative Cloud and Photoshop, while also keeping an eye out for conflicting programs that may be causing the issue. Trust me, these steps are your best bet for a smooth, error-free Photoshop experience.
Errors like these are often the result of software conflicts, outdated versions, or corrupted files, and they can seriously disrupt your workflow. They're the digital equivalent of hitting a roadblock on a highway—annoying, but not insurmountable.
Today, we're going to delve deep into:
Firstly, let's tackle the root of the problem by uninstalling the Creative Cloud Desktop application. Go to your Control Panel, find the 'Programs and Features' section, and locate Adobe Creative Cloud. Right-click and choose 'Uninstall.' This will remove the application and its associated files from your system. (Alternate Method: You can also use third-party uninstaller software like Revo Uninstaller to ensure that all residual files are removed. This can sometimes speed up the process.)
After uninstalling, navigate to the directory C:\Program Files (x86)\Common Files\Adobe\OOBE\PDApp using File Explorer. Here, you'll find a folder named PDApp. Right-click on it and rename it to PDApp_old. (Alternate Method: If you're comfortable with Command Prompt, you can use the rename command to change the folder name. This is often quicker but requires precise syntax.)
Now, head over to Adobe's official website and download the latest version of the Creative Cloud Desktop application. Run the installer and follow the on-screen instructions. (Alternate Method: If you have a reliable internet connection, you can opt for the web installer instead of the offline installer. The web installer is smaller in size but requires an active internet connection throughout the installation process.)
Open Task Manager by pressing Ctrl-Alt-Del simultaneously. In the Processes tab, you'll see a list of currently running programs. Right-click and 'End Task' for programs that you suspect might be conflicting with Photoshop. (Alternate Method: You can also sort the processes by CPU or Memory usage to identify potential culprits more quickly. High usage often indicates a conflicting program.)
If the issue persists, consider downgrading Photoshop. Open the Creative Cloud app, go to the 'All Apps' tab, find Photoshop, and click on the three dots to the right. A drop-down menu will appear; select 'Other Versions' and choose version 24.6. (Alternate Method: If you have a previous version's installer saved on your system, you can use that for a quicker downgrade process.)
Trust me, keeping your software up-to-date is crucial. If an update is available, go ahead and install it. Adobe frequently releases patches that fix known issues. (Alternate Method: You can set Photoshop to auto-update, so you don't have to manually check for updates. However, be cautious as new updates can sometimes introduce new bugs.)
As a last resort, you can uninstall and then reinstall Photoshop. This is similar to Step 1 but focuses solely on Photoshop. Make sure to keep your settings when prompted during the uninstallation process. (Alternate Method: Some users prefer to use Adobe's Cleaner Tool after uninstalling to ensure that all residual files are removed. This can result in a cleaner installation.)
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