# CCTM running error, Could not open GR\_EMIS\_001 file

**URL:** <https://forum.cmascenter.org/t/cctm-running-error-could-not-open-gr-emis-001-file/5644>\
**Category:** Run Time Errors and Issues\
**Created:** [March 5, 2025, 12:53am UTC](https://forum.cmascenter.org/t/cctm-running-error-could-not-open-gr-emis-001-file/5644 "2025-03-05T00:53:50Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![fang63](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.cmascenter.org/fang63/32/42_2.png) [@fang63](https://forum.cmascenter.org/u/fang63)\
**Post date:** [March 5, 2025, 12:53am UTC](https://forum.cmascenter.org/t/cctm-running-error-could-not-open-gr-emis-001-file/5644/1 "2025-03-05T00:53:50Z")

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Hi CMAQ users and developers,

I am trying to run CCTM, it shows these following error messages.

> ```
> |> Reading Emission Control Namelist:
> +======================================
>  
> Performing Basic Error Checks for Emission Scaling Rules
> 
> ```
> 
> GR\_EM\_SYM\_DATE\_0 | F  
> Error reading attribute VAR-LIST  
> netCDF error number -43 processing file “GR\_EMIS\_001”  
> NetCDF: Attribute not found
> 
> ```
> *** ERROR ABORT in subroutine gridded_files_se on PE 000
> Could not open GR_EMIS_001 file
> 
> ```
> 
> PM3EXIT: date&time specified as 0  
> Date&time specified as 0

Could any help me out?  
I am also attaching the log files, Metadata of emission file, and running script with this post.  
[CTM\_LOG\_000.v54\_gcc\_PRD\_2008\_20080101.txt](https://forum.cmascenter.org/uploads/short-url/hZTTDuTO7F1KuMteg8ZK8K2cRe9.txt) (13.8 KB)  
[emis\_mole\_all\_2008001.txt](https://forum.cmascenter.org/uploads/short-url/AobyEcvrm4TlNHJDyMPSd858DJ1.txt) (11.3 KB)  
[job18397408.node482.err.txt](https://forum.cmascenter.org/uploads/short-url/7JHfNxNxLjgEHbkmjOxKYwgv0j3.txt) (15.0 KB)  
[job18397408.node482.out.txt](https://forum.cmascenter.org/uploads/short-url/4tiL5z13PPWyI3xFG77iJs51oMb.txt) (135.7 KB)  
[run\_cctm\_PRD\_200801.csh.txt](https://forum.cmascenter.org/uploads/short-url/eKUj19BUoEGtEeJyx4G044mIV9f.txt) (38.1 KB)

Best,  
Huan

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<div class="post-metadata">

**Author:** ![hogrefe.christian](https://avatars.discourse-cdn.com/v4/letter/h/74df32/32.png) [@hogrefe.christian](https://forum.cmascenter.org/u/hogrefe.christian)\
**Post date:** [March 5, 2025, 1:06am UTC](https://forum.cmascenter.org/t/cctm-running-error-could-not-open-gr-emis-001-file/5644/2 "2025-03-05T01:06:41Z")

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Hello Huan,

like the error message says, your emissions file does not have the required VAR-LIST attribute. Looking further at the ncdump of your emission file (emis\_mole\_all\_2008001.txt), all emission variables are of type double rather than float, further violating conventions for CCTM emission files.

The underlying reason likely is the use of non-Fortran tools to generate this emission file since it results in a file not complying with I/O API conventions. Using Fortran tools than link in the I/O API library and then use those library functions to create and write to the emissions file would avoid these types of errors.