Multiple error messages

I’m trying to customize Sydney Pro and I get a lot of error messages. I tried everything possible, enabling debugging mode, disabling all plugins…
For example errors are:
Customizer Error: “Looks like something’s gone wrong. Wait a couple of seconds, and then try again.”
Deletion failed: undefined
What should I do next?

Hello there,

I am sorry to hear that you have run into issues.

Which version of Sydney Pro are you running? Is it the latest?

To confirm whether this issue is caused by Sydney Pro theme, you can try switching to one of default WordPress themes like Twenty Twenty. Then have a check the customizer panel and do som changes with it. See whether the issue remains or not.

aThemes Support