R Library fixes

I have an existing R library that gets data from a web API. Most commands work but some ( that take optional parameters) seem not to.

> webdata.get_values_rc(Series ="ECB/NZD, ECBFX/GBP")
Error in webdata.get_values_rc(Series = "ECB/NZD, ECB/GBP") :
unused argument (Series = "ECB/NZD, ECB/GBP")
>

The library is mine with sources.

Need an R developer who can fix this really urgently.
Also need to test data is received OK from the API. and the POST parameters are sent correctly.

There are 3 library calls to check - the same issue with all of them. May be something simple.

Thanks