WordPress - permissions maybe ?

I am not able to update my Wordpress theme. the php error log also said:
[15-Mar-2022 02:10:30] WARNING: child 833 said into stderr: "NOTICE: PHP message: PHP Warning: Cannot modify header information - headers already sent in /www/wp-content/plugins/template-creator-ck/template-creator-ck.php on line 32"
I am a little rusty on WordPress, so it could be something I overlooked ?

Hi
this is probably due to another plugin that you installed recently
please try to disable the other plugins and check again
CEd

I disable all the plugins except for Template Creator and still had the issue. I enabled debug and got this message:
Notice: Only variables should be passed by reference in /www/wp-content/plugins/template-creator-ck/interfaces/ajaxcreatetemplatewordpress.php on line 152

ok thanks I will check that
which version of template creator and of wordpress are you using ?

Thank you Ced. This is resolved. I installed all this on my VPS and it works perfect so the issue is with the clients hosting provider. The host offers additional security features that prevent a number of things I am finding. I will just work with and generate my theme from the installation I have on my VPS and copy them over to the "secure" site.

great ! thank you for the infos