/var/www/vhosts/system/example.com/logs/error_log file contains the following error:
CONFIG_TEXT: PHP Fatal error: Allowed memory size of 262144 bytes exhausted (tried to allocate 523800 bytes) in Unknown on line 0
memory_limit value was increased to 1024MB, but the issue persists.
Wrong shortcut for megabyte was used in
Go to Websites & Domains > example.com > PHP Settings and make sure that the correct shortcut for byte values is used:
K (kilo), M (mega), and G (giga). For example, 128M .