Although there could be many reasons, but a couple of candidates of problem source came up to my mind were
(1) Space chars in the path
I usually recommend my customer not include "space" "tab" or non-standard ascii letters in the project path.
(2) Path seems to be very long
The whole path name of "CYPD3174-24LQXQ_pa_opto_fb_Port1_Copy_01" is more than 128 letters.
this could cause problems.
If you can compromise to use path name
"D:\Projects\Vendor Eval Kit 1\Cypress Projects\Test Projects\Test Board\Test Board"
it might help a little.
Having written that a few things I'd try are
(1) If you'd like to keep current path, I will
create a blank project with the name of destination.
Then copy each schematic, pin, and sources from the original project
(2) Create an archive of original project and copy it to more short path (close to the top)
and uncompress the project, open it with PSoC Creator and there try to copy and rename the project