[BioC] error in annotating a list of probeIDs

[Brawni [guest]]

 Hi all,
Im very new to R and Bioconductor so please forgive my poor language! I've been trying to ma on my list of probeIDs the relative annotation but unsuccessfully. I get
this error

The object "probes" is a data.frame so maybe a should change its class? How would i do that?
Thanks a lot


 -- output of sessionInfo(): 

symbols <- mget(probes,mouse4302SYMBOL,ifnotfound=NA)
> Error in .checkKeysAreWellFormed(keys) :
>    keys must be supplied in a character vector with no NAs

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