Hi I need help with a tRowGenerator job.

I have input table that looks like the following:

LocID|LocName|NbrCars
1;TX;3
2;CA;4
3;TN;7
4;WA;9
5;TX;12

I would like to generate a row based on the NbrCars with a new field for CarID that is randomly generated
LocID|LocName|CarID
1;TX;4234
1;TX;42367
1;TX;4543
2;CA;2323
2;CA;98823
2;CA;72342
2;CA;5344
3;TN;42234
3;TN;2234
3;TN;57234
3;TN;67862
3;TN;43333
3;TN;555234
3;TN;342542

I have been using the following pattern

(A) tMySQLInput -> (B) tFlowToIterate -> (C)tRowGenerator -> (D) tIterateToFlow -> (E)tLogRow

(A) - reads a table and defines the schema

(B) - iterates based on NbrCars
             use default (key, value_ in globl variables is checked

(C) - generates rows
          Number of rows for RowGenerator = LocID = (Integer) globalMap.get("row1.nbrcars")
          LocID = (Integer) globalMap.get("row1.location_id")
          LocDec = (String) globalMap.get("row1.location_desc")
          ....
(D) - IterateToFLow 
        mapping fields location_id value = globalMap.get("CURRENT_FILE")
        ....
        ..

I get a type mismatch error: cannot convert Object to String in the tRowGenerator step