# ERROR: Stopping because of EBI convergence failures **URL:** \ **Category:** Run Time Errors and Issues\ **Created:** [March 25, 2019, 4:42pm UTC](https://forum.cmascenter.org/t/error-stopping-because-of-ebi-convergence-failures/582 "2019-03-25T16:42:23Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![ykaore](https://avatars.discourse-cdn.com/v4/letter/y/ce73a5/32.png) [@ykaore](https://forum.cmascenter.org/u/ykaore)\ **Post date:** [March 25, 2019, 4:42pm UTC](https://forum.cmascenter.org/t/error-stopping-because-of-ebi-convergence-failures/582/1 "2019-03-25T16:42:23Z")
Dears, I’m using CMAQv5.2.1 and my simulation fails with the error: ERROR: Max number of EBI time step reductions exceeded Convergence failure for cell ( 23, 11, 1) Convergence failure for the following species:Init.Conc, Pred.Conc. NO2 1.0000E+03 1.0000E+03 ppmV NO 4.3570E+03 4.3570E+03 ppmV \*\*\* ERROR ABORT in subroutine HRSOLVER on PE 000 ERROR: Stopping because of EBI convergence failures PM3EXIT: DTBUF 0:00:00 Dec. 31, 2009 The error appeared in run.cctm log file; however in CTM.log files there were no ERROR messages. The meteorology input data came from WRFv3.9.1.1 Thank you. ---
**Author:** ![foley.kristen](https://avatars.discourse-cdn.com/v4/letter/f/d9b06d/32.png) [@foley.kristen](https://forum.cmascenter.org/u/foley.kristen)\ **Post date:** [April 22, 2019, 7:13pm UTC](https://forum.cmascenter.org/t/error-stopping-because-of-ebi-convergence-failures/582/2 "2019-04-22T19:13:31Z")
Can you please tell me more about the case you are running - spatial domain, time period and the source of your inputs. Once I know a little more I can better direct your question to the appropriate team member. Thanks! ---
**Author:** ![sumit4879](https://avatars.discourse-cdn.com/v4/letter/s/f08c70/32.png) [@sumit4879](https://forum.cmascenter.org/u/sumit4879)\ **Post date:** [August 6, 2019, 6:56am UTC](https://forum.cmascenter.org/t/error-stopping-because-of-ebi-convergence-failures/582/3 "2019-08-06T06:56:59Z")
Dear Foley, It seems we are facing a similar issue if you think you ca help. We are running ISAM CCTM with CMAQv5.0.2. for India at a resolution of 36x36 grids for source apportionment. It runs for 8 hr and 12 mins and stops. With the following error. "ERROR: Max number of EBI time step reductions exceeded Convergence failure for cell ( 23, 12, 1) Convergence failure for the following species: NO2 NO NO3 OH N2O5 PNA ROR CRNO ```auto *** ERROR ABORT in subroutine HRSOLVER on PE 027 ERROR: Stopping because of EBI convergence failures ``` ERROR: Stopping because of EBI convergence failures" The model starts running with 4x7=28 cores in parallal mode and stops. On checking, we found that values of AOTHRj species (of total and all contributing sectors) go extraordinarily high in the range of E18. The problem starts with the first timestep itself when AOTHRj values go very high and at the 8th hour simulation stops with this error. However, when we run the model with only 1 core, the model keeps working with some high values in AOTHRj in totals but not in SA\_ACONC files. We checked, emission files used are working fine with normal cctm mode but shows up this error when tried out in ISAM. Look forward to your suggestions. Thanks Best regards Sumit ---
**Author:** ![lizadams](https://avatars.discourse-cdn.com/v4/letter/l/49beb7/32.png) [@lizadams](https://forum.cmascenter.org/u/lizadams)\ **Post date:** [August 16, 2019, 6:00pm UTC](https://forum.cmascenter.org/t/error-stopping-because-of-ebi-convergence-failures/582/4 "2019-08-16T18:00:44Z")
Please try compiling the code in debug mode to see if the convergence failure goes away. ---
**Author:** ![lwu127](https://avatars.discourse-cdn.com/v4/letter/l/ea666f/32.png) [@lwu127](https://forum.cmascenter.org/u/lwu127)\ **Post date:** [October 5, 2021, 3:25am UTC](https://forum.cmascenter.org/t/error-stopping-because-of-ebi-convergence-failures/582/5 "2021-10-05T03:25:58Z")
Hi, I encountered the same error as you. I wonder if you solved the problem. If so, could you share the solution with me? Thanks! Lin ---
**Author:** ![lizadams](https://avatars.discourse-cdn.com/v4/letter/l/49beb7/32.png) [@lizadams](https://forum.cmascenter.org/u/lizadams)\ **Post date:** [November 15, 2021, 4:23pm UTC](https://forum.cmascenter.org/t/error-stopping-because-of-ebi-convergence-failures/582/6 "2021-11-15T16:23:20Z")
Hi Lin, Please submit a new ticket using the Best Practices listed on the following link. Please use the latest release of CMAQv5.3.3, not CMAQv.5.2.1 > [@PLEASE READ before posting](https://forum.cmascenter.org/t/please-read-before-posting/1321): > > Welcome to the CMAS Forum! Here, users and developers can discuss issues related to the U.S. EPA’s [CMAQ](http://www.epa.gov/cmaq) modeling system and associated [software](https://github.com/USEPA/CMAQ) maintained by the U.S. EPA and the CMAS Center. Please review all five steps prior to submitting requests for assistance to the CMAS Center Forum. [Search](https://forum.cmascenter.org/search?expanded=true) the CMAS Forum and review the [CMAQ FAQ](https://www.epa.gov/cmaq/frequent-cmaq-questions) for an error or problem similar to the one in your log file. If you need help identifying your error please review the [Debug Tutorial](https://github.com/USEPA/CMAQ/blob/master/DOCS/Users_Guide/Tutorials/CMAQ_UG_tutorial_debug.md) If you don’t see a sim… Thank you, Liz