theme install error loading content

Hi,

I have reinstalled wordpress folders on the server in two locations after an attack and at the same time updated to php 8.1.

Website 1 works and all is ok.

Website 2 works and dashboard is ok, except for ‘add new theme’ page where cannot load new themes:
“An unexpected error occurred. Something may be wrong with www.remarpro.com or this server’s configuration. If you continue to have problems, please try the support forums.”
../wordpress/wp-admin/theme-install.php?browse=popular

However, if I browse to customize theme menu and then on the ‘change theme’ and ‘www.remarpro.com’ themes I can browse and install new themes.
../wordpress/wp-admin/customize.php?return=%2Fwordpress%2Fwp-admin%2Fthemes.php

I have tried re-uploading wp-admin files etc via ftp. I have checked the CHMOD 750 and all is well. I have disabled (renamed via ftp) all plugins and other themes.

I am sure the page was ok initially after reinstalling as I am sure I installed at least one new theme so not sure how it could break.. maybe it is

Any other suggestions as to what I can check to fix this?

Thanks,
yes maybe

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