Sometimes, Spot your train feature does not gives you the required information. This could be due to any of the following reasons:
Specified train number or train name is not valid and hence train running status is not available
Specified Train does not run on the selected date
Sometimes due to network issue or congestion, information is not fetched from the Indian Railways system
If you are checking train running status through your mobile or laptop via internet connection, then due to low or no internet network on your device, this information is not fetched