my photos software shows error -36 and doesn't open to view. Can anyone help out please?

Hello, Iitald.

Sorry that you're having this trouble with Photos on Mac.

Here are a couple links to some troubleshooting info for the Photos app. Maybe you'll find something useful there:

How to use the Photos Repair Library on your Mac - Apple Support

Get help with the Photos app on your Mac - Apple Support

Also, as a general troubleshooting step for the Mac, you should reboot your Mac and see if the problem is cleared. If rebooting your Mac doesn’t fix things, see if the problem still happens in Safe mode (hold the shift key down at startup). It can take much longer to safe boot (10 min) so be patient.

How to use safe mode on your Mac - Apple Support 

Safe mode forces the OS to clear certain caches and logs and do other miscellaneous housekeeping. It's non-destructive to user data so is safe to do. Very often certain weird software behavior is corrected by simply logging in this way as a troubleshooting method. When you're in safe boot, the machine will not be at its best performance, especially with graphics, but that's expected.

Does the problem persist while in Safe mode?

Exit safe mode by restarting your Mac normally and re-evaluate the issue again.

If the problem is still unresolved, please return here and post a reply and we’ll see what else we can come up with for help.

That -36 error is an I/O error, meaning likely it could not open the Photos library, or image if it were on an external drive. It could mean the external drive is corrupted or even failing.