Hi @Lazar_Stosic,
The relevant message is this one:
[04-Sep-2019 12:43:29 Europe/Belgrade] ojs2: DB Error: The SELECT would examine more than MAX_JOIN_SIZE rows; check your WHERE and use SET SQL_BIG_SELECTS=1 or SET MAX_JOIN_SIZE=# if the SELECT is okay
See e.g. this thread: Database Error (DB Error)
Regards,
Alec Smecher
Public Knowledge Project Team