There are several ways to solve Adobe Photoshop's prompt "Unable to complete the request because of program error":
Method 1:
1. Click "Edit" - "Preferences" - "Performance" to enter the performance setting page.
2. In the Memory Usage tab, adjust the memory usage ratio to 70% to 80%.
3. In the temporary storage disk tab, check all the drive letters except for drive C.
4. In the preferences of file processing, select Clear Cache and set the cache size to 5G. At the same time, select a non system disk (such as disk F) in the cache storage location, and click OK to complete the setting.
Method 2:
If method 1 still fails to solve the problem, it may be that the virtual memory of the computer is set incorrectly. Please adjust according to the following steps:
1. Right click "My Computer" and click "Properties".
2. Select Advanced System Settings in the property page.
3. Click the setting button in the performance tab.
4. Click the Change button in the Advanced tab.
5. For each partition, modify the initial size and maximum value of the setting page to about 5000MB, and ensure that each modification is saved. Please note that you need to click Set before clicking OK to modify each item.

6. After confirming to save, the system will automatically pop up a dialog box, please click OK.
The above two methods are common ways to solve program errors. If the problem persists, you may need to check the compatibility of the software with your PC. I hope these methods can help you solve the problem that you cannot complete the request.
In addition, I recommend installing a stable version of Photoshop to ensure a better use experience.

"Program error" may be a common problem in Photoshop, but it can be solved in many ways. Since Photoshop involves many factors, such as software, environment and computer itself, the solution only needs to take action for each factor accordingly. Updating Photoshop software, closing plug-ins, reconfiguring, adjusting system configuration, and resetting Photoshop preferences are the most basic operations. Of course, improper operation may lead to more serious problems, or even data loss. Therefore, it is better to back up data before deciding which method to take.