Minimum error exceeds allowable tolerance

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Minimum error exceeds allowable tolerance

George
Hello, i am new Hec-Ras user. I am building a model that consists of 4 streams that channel water into a moat and i want to run an unsteady flow simulation.
As for boundary conditions i have a flow hydrograph for each stream and a normal depth downstream at the moat
When i run the simulation it was terminated and i got this message:

Performing Unsteady Flow Simulation  HEC-RAS 5.0.6 November

Maximum iterations of 20               RS WSEL ERROR

Solution solver went unstable, iteration 12 at 10APR2019 00:10:00
Korakas         Rema 3           201       35.77  12.423
Solution solver went unstable, iteration 17 at 11APR2019 00:20:00
Korakas         Rema 3           458       25.12   8.712
11APR2019 00:30:00  Gkalntrimos     Rema 4           163        9.19   4.313
Solution solver went unstable, iteration 14 at 11APR2019 00:40:00
Korakas         Rema 3           1249       33.51   7.934

   ****   ERROR:  Solution Solver Failed   ****

Minimum error exceeds allowable tolerance at   11APR2019   00:40:00

Korakas         Rema 3           1249

*****  Warning!  Extrapolated above Cross Section Table at:  *****
       (The extrapolation may have been caused by model instability)

    tafros_litoxwrou litoxwro 2    R.S.   20733
    tafros_litoxwrou litoxwro 2    R.S.   19306

Writing Results to DSS
 

   ****   The Model Has One Or More Error(s)   ****

Unsteady Flow Simulation Terminated

Computations Summary

Computation Task Time(hh:mm:ss)
Completing Geometry(64)       9
Preprocessing Geometry(64)       2
Unsteady Flow Computations(64)       1
Complete Process      18

Can anyone help me with this ?