after admin login->blank page

hi, after succesfull admin login, in page preview there is page error https://i.imgur.com/HP0eco9.png
(An error occurred while connecting to kourtakis-lighting.gr.

Please contact the website owners to inform them about this problem.)
If you just visit kourtakis-lighting.gr there is no problem, but if on the same browser you login as admin then the above error appears.
I have tried cleaning cache and on other browsers but the issue persists.
P.S you have credentials given on other tickets

Hello,

Your issue has been solved. Please check the site after removing the browser and site cache. Actually, you have updated the theme but did not update the theme plugins. I have updated the theme’s core plugin, now check the site.

Best Regards.

[Author]

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