Exception in component tFileExcelReferencedCellInput_1
java.lang.Exception: Cell does not exists: ref=null sheet=1 row=2 col=B
I guess you see it more complex as it is actually.
Every input row of the component addresses one cell and it does not matter in which sheet it is.
If you have 3 sheets with 4 cells you have to define 4 rows in the tFixedFlowInput and because of the iteration through the tFileExcelSheetList you get in the end 12 rows.
The component unfortunately does not support a cell range. To digger the values of cell ranges you should use the tFileExcelSheetInput.
Exception in component tFileExcelReferencedCellInput_2
java.lang.IllegalArgumentException: Row index must >= 1