Please review the posting guidelines.
- What version of the model are you using?
- What is this modeling case? Is it the benchmark tutorial, or something of your own?
- Does this error occur immediately, or after running for several hours or days?
Convergence problems in the chemistry solver are almost always due to something other than the chemistry. Most often, it’s the emissions. Check the log file. Are there earlier indications that something has gone wrong, such as NaNs or Infinity values after any of the science processes?