negative coil bypass factor ?

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Could someone tell my the reasons and how to fix thiss errors

Severe  ** Coil:Cooling:DX:VariableRefrigerantFlow "VRF ZONE TERMINAL COOLING COIL" -- negative coil bypass factor calculated.
**   ~~~   **  Environment=DANANG QCVN02:BXD(2022) T9, at Simulation time=09/30 24:00 - 24:12
**  Fatal  ** Coil:Cooling:DX:VariableRefrigerantFlow "VRF ZONE TERMINAL COOLING COIL" Errors found in calculating coil bypass factors
...Summary of Errors that led to program termination:
..... Reference severe error count=28
..... Last severe error=Coil:Cooling:DX:VariableRefrigerantFlow "VRF ZONE TERMINAL COOLING COIL" -- negative coil bypass factor

Thanks