RePorongonSidoso that's not your plutonium directory... that's your illegal, non-supported, pirated game files directory... sorry, couldn't help being passive aggressive 
they go in your plutonium directory... %localappdata%/plutonium/storage/t6/images
RePorongonSidoso can you tell me the full folder path you put it in?
nexbo if you have client field mismatch and checkerboard issue that means the person is missing files (usually map files (usually DLC content)).
Dark89 %localappdata%/plutonium
@Racoon_ youtube videos are way old and outdated... use the texture guide on the official plutonium.pw website.
the t6r folder has been a no no for a while now (years) and the latest update finally killed it.
custom textures go into storage/t6/images folder in your plutonium directory.
ItzPlayer5 no worries! lots of folks had it set up that way and i get it that most folks don't pay too much attention to change logs
the good part is that it's an easy fix!!
@Racoon_ a lot to unpack here
piracy is not supported, no files are provided for free, get your game and DLCs from steam.
the t6r method should not be used, it was warned a while ago not to use that method and the latest update finally killed it. your textures go in "storage/t6/images" in your plutonium directory
you can also put your mods folder in the storage t6 folder if you have those.
ItzPlayer5 you probably have them in a folder called t6r which is an unsupported method that was warned wasn't going to work a long time ago and the latest update finally stopped allowing it.
Your textures need to be in the "storage/t6/images" folder in your plutonium directory.
puddleofnut is it all maps or DLC maps? i've seen this happen for people who try to join DLC maps but don't actually own the maps.
@Flurry3485 you would have to find the owner of the server and ask that to the... plutonium doesn't micro manage individual servers... server owners can do what they please. Best bet is to see if they have a discord channel or a website and you can ask to be unbanned. but based on how most of these notorious ban-happy server owners, you might be out of luck.
SwatB do you have your plutonium on the taskbar pinned? don't do that.
unpin it and launch plutonium from the actual .exe
if you want to play the maps for free then you are trying to pirate them. Plutonium does not come with any game files anymore, you have to get your own files and piracy is no longer allowed / supported. You can find legit files on Steam.
Pirated copies are no longer allowed. Steam files are the way to go! get the game from steam and then point plutonium to your steam game directory.
you don't know the purpose of plutonium if you think that :D.
Plutonium is a launcher to make your steam files safe to play online, give you access to plutonium features like dedicated servers and be able to mod / play with scripts. It is NOT about playing the game for free.
Pirated files are no longer allowed. Things changed about a year ago when activision started shutting folks down.
@Hong-Kong-Lover rip!? are you ok?
where did you "download" your game from? all you should have to do is point plutonium to your game folder... ie: C:\ProgramFiles(x86)\steam\steamapps\common\GAME FOLDER HERE
Jeice Twiggs why are you reporting that here? as previously mentioned in this very old thread, you need to report them to the server owner.
jach5044 in case you don't want click the link.. here's the important bit:
Caution
The anticheat is always active even in solo play / private match.
If you wish to cheat in private / solo you can use the launchers LAN mode which disables online functionality and disables the anticheat.
launch plutonium from the .exe and NOT from a pinned taskbar. when you pin the .exe while it is running, it pins just the launcher and doesn't run the updater... so your stuff is not updated
CombatWombat21 if you installed the server the way the website says to then there should be nothing in your server's scripts folder causing this error... you likely copied folders over and there is obviously a script in your scripts folder (the zombies one based on the error) that is causing issues.
A fresh server creation process might do you good (using the guide on the website and nothing else) OR you can do what Resxt said and follow the other answers in the thread (delete any add-on scripts)