I cant enable Mail app by error: Exception: Call to undefined function is_executable()

Mail app downloaded but dont start app mail. here is log

{"reqId":"ddkufhgoanguhfgjnsdfg","level":3,"time":"2021-11-09T12:20:00+00:00","remoteAddr":"11.111.111.111","user":"xxxxx","app":"index","method":"POST","url":"/index.php/settings/apps/enable","message":"Call to undefined function is_executable()","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.69 Safari/537.36","version":"22.2.0.2","exception":{"Exception":"Exception","Message":"Call to undefined function is_executable()","Code":0,"Trace":[{"file":"/www/hosting/domainname.cz/www/lib/private/AppFramework/App.php","line":156,"function":"dispatch","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/www/hosting/domainname.cz/www/lib/private/Route/Router.php","line":301,"function":"main","class":"OC\\AppFramework\\App","type":"::"},{"file":"/www/hosting/domainname.cz/www/lib/base.php","line":1000,"function":"match","class":"OC\\Route\\Router","type":"->"},{"file":"/www/hosting/domainname.cz/www/index.php","line":36,"function":"handleRequest","class":"OC","type":"::"}],"File":"/www/hosting/domainname.cz/www/lib/private/AppFramework/Http/Dispatcher.php","Line":158,"Previous":{"Exception":"Error","Message":"Call to undefined function is_executable()","Code":0,"Trace":[{"file":"/www/hosting/domainname.cz/www/lib/private/Repair.php","line":123,"function":"run","class":"OCA\\Mail\\Migration\\MakeItineraryExtractorExecutable","type":"->"},{"file":"/www/hosting/domainname.cz/www/lib/private/legacy/OC_App.php","line":1059,"function":"run","class":"OC\\Repair","type":"->"},{"file":"/www/hosting/domainname.cz/www/lib/private/Installer.php","line":157,"function":"executeRepairSteps","class":"OC_App","type":"::"},{"file":"/www/hosting/domainname.cz/www/apps/settings/lib/Controller/AppSettingsController.php","line":447,"function":"installApp","class":"OC\\Installer","type":"->"},{"file":"/www/hosting/domainname.cz/www/lib/private/AppFramework/Http/Dispatcher.php","line":217,"function":"enableApps","class":"OCA\\Settings\\Controller\\AppSettingsController","type":"->"},{"file":"/www/hosting/domainname.cz/www/lib/private/AppFramework/Http/Dispatcher.php","line":126,"function":"executeController","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/www/hosting/domainname.cz/www/lib/private/AppFramework/App.php","line":156,"function":"dispatch","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/www/hosting/domainname.cz/www/lib/private/Route/Router.php","line":301,"function":"main","class":"OC\\AppFramework\\App","type":"::"},{"file":"/www/hosting/domainname.cz/www/lib/base.php","line":1000,"function":"match","class":"OC\\Route\\Router","type":"->"},{"file":"/www/hosting/domainname.cz/www/index.php","line":36,"function":"handleRequest","class":"OC","type":"::"}],"File":"/www/hosting/domainname.cz/www/apps/mail/lib/Migration/MakeItineraryExtractorExecutable.php","Line":61},"CustomMessage":"--"},"id":"idjofgd5544dg"}
i read this thread - Can not activate Mail app after migration 19 to 20 · Issue #3784 · nextcloud/mail · GitHub but i cant see this table " mail_coll_addresses" in my db

can you help me?

what environment is that? do you run your own server? Someone disabled is_executable for your php environment.

Hi, sry for late reply. Yes its own server self hosted NC. Now we success enable mail ap by this manual: “Resetting the app” - mail/developer.md at main · nextcloud/mail · GitHub

but now we cant load email message - logging write this:
image

Environment:
PHP Version => 8.0.13
OS: Linux version 5.10.0-9-amd64 (debian-kernel@lists.debian.org) (gcc-10 (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2) #1 SMP Debian 5.10.70-1 (2021-09-30)

Hi there, any news about this issue? We are able send message from Nextcloud Mail app, but not able open body of the message. We see just header and loading icon.
2022-01-11 06_57_30-Window
Thanks.

Hello Christoph, we put two screen with more information below. Do you have any idea, please?
I can see also source (code) of selected email, but GUI does not load.