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How to Solve "Tank is Empty" Problem?

I am having one tank which is getting water from reservoir. 

While running EPS for 24 hrs., I am getting an error of the "Tank is Empty" at around 21:00 hrs.

I have placed FCV at the inlet of the tank, with the initial setting of flow equals to the total demand at the D/s node of the tank. 

Also, the initial level in the tank gives that the tank is 30 % full at the start of the simulation. 

The Velocity in the inlet pipe is around .98 m/s, HLG is below 5 m/km, and the Required HGL is available at the tank throughout 24 hrs.

What shall I do if the tank is showing empty ?