# Error when running ICON and BCON

**URL:** <https://forum.cmascenter.org/t/error-when-running-icon-and-bcon/1270>\
**Category:** CMAQ\
**Created:** [January 31, 2020, 8:38am UTC](https://forum.cmascenter.org/t/error-when-running-icon-and-bcon/1270 "2020-01-31T08:38:01Z")\
**Posts on this page:** 1\
**Showing post:** 8

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**Author:** ![cjcoats](https://avatars.discourse-cdn.com/v4/letter/c/ac8455/32.png) [@cjcoats](https://forum.cmascenter.org/u/cjcoats)\
**Post date:** [March 26, 2020, 7:20pm UTC](https://forum.cmascenter.org/t/error-when-running-icon-and-bcon/1270/8 "2020-03-26T19:20:51Z")

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Most likely the second reason: _ioapi/dscgrid.f_ is carefully coded ([see the fifth item under “Coding” in Models-3 Coding Standards document](https://cjcoats.github.io/ioapi/STANDARDS.html)) so that **any** I/O error will generate a detailed log message. In the absence of such a message, we may be quite sure that the `GNAME` argument to the `DSCGRID` call is not a name present in the _GRIDDESC_ file.

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