
Dear list, 

I am using AsciiGridPredict from the yaImpute package to make a spatial prediction of a randomForest model. When I call AsciiGirdPredict I am getting an error message, that I do not understand:

AsciiGridPredict(st.rf.fit, xlist, ylist, xtypes=NULL, rows=NULL, myPredFunc=NULL)

Rows per dot:  8  Rows to do: 884 
ToDo: ..............................................................................................................
Done: Error in unionDataJoin(m1, m2) : 
  row names are requried within all input matrices
In addition: Warning message:
In AsciiGridImpute(object, xfiles, outfiles, xtypes = xtypes, lon = lon,  :
  NA's generated due to illegal level(s).

Does someone know what the error means and how I can solve this problem?

Thank you very much in advance,
Frauke



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