Minecraft Server created at Creative but can no longer switch from survival to Creative?

I created a minecraft server through Twitch (with mods) I created the server in the Creative I also switched from Creative to Survival as normal for 2 days but it doesn't work anymore I don't even / Time set Fax or something in please type in the direction and help

Are you perhaps no longer an op on the server? The times in the console of the server and give

/ op player acquisition

What's in the console?

Tried to enter this but not all of the font is red and when I send it says unknown or incomplete command