Error - function join()

Hi R-listers, 

In plyr I am using coding I have used before but an error seems to be
apparent. Has the function "join" been replaced by another word? I tried
this before and it didn't work and then worked for me. But now it is not
working again. 

Please advise, Jean

data.to.analyze <- join(responses, envir, by="QuadratEvent")

Error: could not find function "join"



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