[R] Error in FUN(X[[1L]], ...) : STRING_ELT() can only be applied to a 'character vector', not a 'integer'

[sedm1000]

I am receiving this error running a command on a multi-row data-frame. The
data is strings of text (each with new line separator, no spaces, no
numerical characters).

Error in FUN(X[[1L]], ...) :
 STRING_ELT() can only be applied to a 'character vector', not a 'integer'

I can run single text string into the same command, and so the issue seems
to be how the package deals with the second row - but I can't work out quite
where the deficit is. 

If anybody has spotted this error before, and knows how to resolve it, that
would be much appreciated.

Cheers.

R version 2.11.0 (2010-04-22) 
i386-apple-darwin9.8.0 

locale:
[1] en_US.UTF-8/en_US.UTF-8/C/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] GeneRfold_1.6.0 GeneR_2.18.0   

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