I have been coming across this same error 'no valid fields were selected' with different tool numbers when I have been trying to do time series forecasting .I think its a problem with the data.
As an aside is there any limitations on the number of covariates when using ARIMA model.
PFA below the screenshots of the workflow and data.
Thank you.
Hey @Kumarivaturi,
If your making a covariate ARIMA model you should use the TS covariate forecast tool to forecast not the TS forecast tool: