# Error running CMAQ

**URL:** https://forum.cmascenter.org/t/error-running-cmaq/3805
**Category:** CMAQ
**Tags:** cmaq
**Created:** [December 29, 2022, 6:16am UTC](https://forum.cmascenter.org/t/error-running-cmaq/3805 "2022-12-29T06:16:57Z")
**Posts on this page:** 4
**Page:** 1

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### Author: ![lifenx](https://avatars.discourse-cdn.com/v4/letter/l/c0e974/32.png) [@lifenx](https://forum.cmascenter.org/u/lifenx)
#### Post date: [December 29, 2022, 6:16am UTC](https://forum.cmascenter.org/t/error-running-cmaq/3805/1 "2022-12-29T06:16:57Z")

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Hi，I made the following error when using CMAQ5.3.2 for simulation. The chemical mechanism is cb6r3\_ae6\_aq. I have never encountered this situation before. Thank you. I attach my own log file.

 ![image](https://canada1.discourse-cdn.com/flex027/uploads/cmas/original/2X/5/573e2a684e8a84605ed03487f18caff7176e5fbc.png)  
[CTM\_LOG\_001.v532\_pgi\_cn36\_20190110.txt](https://forum.cmascenter.org/uploads/short-url/8kC0FJmICXkSKJhJKihn4NZQrQz.txt) (67.8 KB)

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### Author: ![lizadams](https://avatars.discourse-cdn.com/v4/letter/l/49beb7/32.png) [@lizadams](https://forum.cmascenter.org/u/lizadams)
#### Post date: [January 3, 2023, 3:09pm UTC](https://forum.cmascenter.org/t/error-running-cmaq/3805/2 "2023-01-03T15:09:17Z")

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Hi,  
I believe this is just a warning and not an error.

```auto
     ATTENTION: Attempt to include subgrid cloud effects: photolysis rates           
       include ACM CLOUD effects. It would be prudent to examine diagnostic            
       cloud fractions.
 
     
     >>--->> WARNING in subroutine INIT_PHOT_MET on PE 001
     Variable CFRAC_3D (cloud fraction) not found in MET_CRO_3D
     M3WARN: DTBUF 0:00:00 Jan. 10, 2019
 
     Model will diagnose layer cloud fraction using Randall (1995) and Hong          
       (1998), based on mixing ratios of water vapor and its condensed states.         
       You may want to reprocess the meteorological data to obtain layer cloud         
       fractions if possible.

          INIT_PHOT_MET: Cloud has QC, QR, QG, QI and QS

```

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<div class="post-metadata">

### Author: ![lifenx](https://avatars.discourse-cdn.com/v4/letter/l/c0e974/32.png) [@lifenx](https://forum.cmascenter.org/u/lifenx)
#### Post date: [February 3, 2023, 2:52pm UTC](https://forum.cmascenter.org/t/error-running-cmaq/3805/3 "2023-02-03T14:52:48Z")

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Thank you for your reply. I have realized the problem.

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### Author: ![lizadams](https://avatars.discourse-cdn.com/v4/letter/l/49beb7/32.png) [@lizadams](https://forum.cmascenter.org/u/lizadams)
#### Post date: [February 7, 2023, 10:07pm UTC](https://forum.cmascenter.org/t/error-running-cmaq/3805/4 "2023-02-07T22:07:58Z")

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