You might like to search for the word 'remove' in all of your script files. This is not as daunting as it may first seem!
Press ALT+R and then press the 'Find Text' button - put in the word 'remove' and look through the script file. When you find something, look at the line it's on and see if you can fix any errors. If you have absolutely no idea then leave it - it's best not to fiddle with something if you don't know what it does! You can go to View in the menubar in the scripts editor and choose a different script file.
And yes, /remove is a command. See /help /remove when in mIRC.
Best of luck!
Regards,
