Diagnosis
An error occurred, when calling the method &2 of class &1.
An aggregation cannot be done using column &3.This occurred because the data type for this column does not allow itor because aggregation has been forbidden for this column.

Procedure
Check whether this column is of the following type:
Date
Time
String
Character
Aggregation cannot be done using these types.
Check whether this column has already been called withCL_SALV_AGGREGATIONS->SET_COLUMN_AGGREGATION_ALLOWED( FALSE ). Eitherdelete this call or call again with TRUE.