# ACCESS-rAM3, error in simulation due to dateline (180 degree meridian) **URL:** \ **Category:** rAM3/Regional Nesting Suite\ **Tags:** help\ **Created:** [2 July 2026 04:53 UTC](https://forum.access-hive.org.au/t/access-ram3-error-in-simulation-due-to-dateline-180-degree-meridian/6585 "2026-07-02T04:53:33Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![Leena](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.access-hive.org.au/leena/32/4309_2.png) [@Leena](https://forum.access-hive.org.au/u/Leena)\ **Post date:** [2 July 2026 04:53 UTC](https://forum.access-hive.org.au/t/access-ram3-error-in-simulation-due-to-dateline-180-degree-meridian/6585/1 "2026-07-02T04:53:33Z")
Hi Team, I am running the model over Auckland, New Zealand, using 1 km and 4 km domains. The boundary of the 4 km domain crosses the 180° meridian (International Date Line), which is causing an error. Could you please help resolve this issue? Please find the domain plot and the error files here: [access-ram3 error - Google Drive](https://drive.google.com/drive/folders/1ipx1yqu3SqQnXT1kAbdSR3ICCCvhxzb4?usp=sharing) Thank you, Kind regards, Leena ---
**Author:** ![cbengel](https://avatars.discourse-cdn.com/v4/letter/c/ce7236/32.png) [@cbengel](https://forum.access-hive.org.au/u/cbengel)\ **Post date:** [2 July 2026 05:09 UTC](https://forum.access-hive.org.au/t/access-ram3-error-in-simulation-due-to-dateline-180-degree-meridian/6585/2 "2026-07-02T05:09:14Z")
Hi @Leena, The BICGstab error indicates that there are NaN’s in the input files. It is likely that there are NaN’s in your ancillary files. @Paul.Gregory has a package that can scan your ancillaries for you, otherwise you can send me your suite and I can diagnose and fix the ancillary for you. Best regards, @cbengel ---
**Author:** ![Leena](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.access-hive.org.au/leena/32/4309_2.png) [@Leena](https://forum.access-hive.org.au/u/Leena)\ **Post date:** [2 July 2026 05:14 UTC](https://forum.access-hive.org.au/t/access-ram3-error-in-simulation-due-to-dateline-180-degree-meridian/6585/3 "2026-07-02T05:14:23Z")
Hi @cbengel , Thank you for your reply and help. Can you access suite here: /home/561/lk5320/roses/u-dx356\_AUK\_1.. ? or please let me know how can I share it. Thank you, Kind regards, Leena ---
**Author:** ![cbengel](https://avatars.discourse-cdn.com/v4/letter/c/ce7236/32.png) [@cbengel](https://forum.access-hive.org.au/u/cbengel)\ **Post date:** [2 July 2026 05:15 UTC](https://forum.access-hive.org.au/t/access-ram3-error-in-simulation-due-to-dateline-180-degree-meridian/6585/4 "2026-07-02T05:15:29Z")
I can’t but it is ok. Let’s talk offline with @mlipson about it. Sending you a message via W21C. ---
**Author:** ![cbengel](https://avatars.discourse-cdn.com/v4/letter/c/ce7236/32.png) [@cbengel](https://forum.access-hive.org.au/u/cbengel)\ **Post date:** [2 July 2026 05:20 UTC](https://forum.access-hive.org.au/t/access-ram3-error-in-simulation-due-to-dateline-180-degree-meridian/6585/5 "2026-07-02T05:20:49Z")
see [This post](https://forum.access-hive.org.au/t/aus2200-vegetation-fraction-ancil-creation-issues/1972/24) ---
**Author:** ![Leena](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.access-hive.org.au/leena/32/4309_2.png) [@Leena](https://forum.access-hive.org.au/u/Leena)\ **Post date:** [2 July 2026 05:29 UTC](https://forum.access-hive.org.au/t/access-ram3-error-in-simulation-due-to-dateline-180-degree-meridian/6585/6 "2026-07-02T05:29:38Z")
Sure Thanks @cbengel ---
**Author:** ![clairecarouge](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.access-hive.org.au/clairecarouge/32/380_2.png) [@clairecarouge](https://forum.access-hive.org.au/u/clairecarouge)\ **Post date:** [20 July 2026 03:14 UTC](https://forum.access-hive.org.au/t/access-ram3-error-in-simulation-due-to-dateline-180-degree-meridian/6585/7 "2026-07-20T03:14:28Z")
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**Author:** ![cbengel](https://avatars.discourse-cdn.com/v4/letter/c/ce7236/32.png) [@cbengel](https://forum.access-hive.org.au/u/cbengel)\ **Post date:** [20 July 2026 03:27 UTC](https://forum.access-hive.org.au/t/access-ram3-error-in-simulation-due-to-dateline-180-degree-meridian/6585/8 "2026-07-20T03:27:20Z")
Hi @Leena, just to finalize this post for others. The problem was actually that the ancillaries had missing values in them. The solution was to re-run the Regional Ancillary suite applying @mlipson’s workaround ( [AUS2200 vegetation fraction ancil creation issues - #20 by mlipson](https://forum.access-hive.org.au/t/aus2200-vegetation-fraction-ancil-creation-issues/1972/20) ). ---
**Author:** ![clairecarouge](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.access-hive.org.au/clairecarouge/32/380_2.png) [@clairecarouge](https://forum.access-hive.org.au/u/clairecarouge)\ **Post date:** [20 July 2026 03:28 UTC](https://forum.access-hive.org.au/t/access-ram3-error-in-simulation-due-to-dateline-180-degree-meridian/6585/9 "2026-07-20T03:28:46Z")