Trying to exclude a list of words

[Virginia Tompkins]

Hello,

I am trying to exclude a list of words from my transcripts using a command 
and word list that I have previously used successfully, but I'm now having 
trouble getting it to work. The command I am using is:

freq +t*CHI +r6 -s at exclude.txt filename.cha

and the message I receive is:

Multi-words are not allowed with option: -s
    Multi-words are search patterns with space character(s) in-between.
    If you did not mean to have space characters in-between words,
        then please remove space characters and try again.

What does this mean? 

Thanks,
Virginia 

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