Что означает ошибка Error(700):No progress on minimum timestep.

Вот выписка из output:
.....
Scanning recurrent section
Recurrent section scanned successfully
Number of wells=5, number of groups=1

Simulating to time 10.0 days
Reducing timestep to 0.250 at time 0.0 days
Reducing timestep to 0.063 at time 0.0 days
Reducing timestep to 0.016 at time 0.0 days
Reducing timestep to 0.004 at time 0.0 days
Reducing timestep to 0.977E-3 at time 0.0 days
Reducing timestep to 0.244E-3 at time 0.0 days
Reducing timestep to 0.061E-3 at time 0.0 days
Reducing timestep to 0.015E-3 at time 0.0 days
Reducing timestep to 0.004E-3 at time 0.0 days
Reducing timestep to 0.954E-6 at time 0.0 days
Error(700):No progress on minimum timestep[/font][/size]
Peak memory allocated 13.75 MB, 35.200 KB/active cell
Total iterations: 150 Non-Linear, 150 Linear
CPU time= 0.98 secs
Elapsed time= 2.00 secs
1 errors, 1 warnings, 0 messages
Warning 266 (Excess lines of PVTO data in case with no gas) has occurred once
Error 700 (No progress on minimum timestep) has occurred once
Run finished: errors found