I will answer my own question. I am new to OS. The issue is my data file do not have any data for the Amount Column. As soon I populate data from the source file it is working as expected.
Note: If the Scenario & Time configuration is correct and if you are getting this error please check the data file for the amount column. The only thing is the error message was so strange.
This might help someone in future.
I am facing the same issue. I tried adding a column amount and also explicit columns for time and scenario but it still wont work.
