Sometimes the "Could not complete your request because of a program error" appears when you have a permissions changed in any folder. Maybe plugins or fonts.
I suggest check the "PSErrorLog.txt" (Library/Preferences/Photoshop CC Settings/PSErrorLog.txt)
The error log says:
2018:01:19 10:12:38 : /Users/esbuilder/Jenkins/PS/PS19/Mac_Release/20171103.r.190/photoshop/main/photoshop/sour ces/UVMBytes.cpp : 241 : REQUIRE failed
Can you tell me what this means?
If the problems is a plug in, maybe you can try Photoshop plug-ins troubleshooting
Identify the problematic plug-in
To quickly determine whether Photoshop is loading a problematic optional or third-party plug-in, do the following:
Here is other possible solutions Error message: "Could not complete your request because of a program error"
Im not sure what meas the "UVMBytes.cpp"