Help Me to fix my error

hay guys i have one model for distribution water using epanet , and when i’m running it there is some error like

  1. system ill conditioned at node 89
  2. reservoir is closed
  3. system error 110 : cannot solve network hydraulic equations
    i hope somebody can help me to fix this :slight_smile: i also to find " how to fix that problem" but i didnt found it
    thanks you