# Could not read DENSA\_J from MET\_CRO\_3D

**URL:** <https://forum.cmascenter.org/t/could-not-read-densa-j-from-met-cro-3d/2507>\
**Category:** CMAQ\
**Created:** [July 14, 2021, 2:01pm UTC](https://forum.cmascenter.org/t/could-not-read-densa-j-from-met-cro-3d/2507 "2021-07-14T14:01:24Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Rainzmh](https://avatars.discourse-cdn.com/v4/letter/r/b5a626/32.png) [@Rainzmh](https://forum.cmascenter.org/u/Rainzmh)\
**Post date:** [July 14, 2021, 2:01pm UTC](https://forum.cmascenter.org/t/could-not-read-densa-j-from-met-cro-3d/2507/1 "2021-07-14T14:01:24Z")

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Dear Sir,  
I have occur a error when I run cctm.csh.The error is as follow:

```auto
    GC loaded into CGRID
     netCDF error number -40
     
     >>--->> WARNING in subroutine RDTFLAG
     Error reading netCDF time step flag for MET_CRO_3D
     M3WARN: DTBUF 20:00:00 April 9, 2017 (2017099:200000)
     
     >>--->> WARNING in subroutine XTRACT3
     Time step not available for file: MET_CRO_3D
     M3WARN: DTBUF 20:00:00 April 9, 2017 (2017099:200000)

     *** ERROR ABORT in subroutine LOAD_CGRID on PE 005      
     Could not read DENSA_J from MET_CRO_3D
 PM3EXIT: DTBUF 20:00:00 April 9, 2017 
     Date and time 20:00:00 April 9, 2017 (2017099:200000)

```

Thanks a lot!

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<div class="post-metadata">

**Author:** ![cjcoats](https://avatars.discourse-cdn.com/v4/letter/c/ac8455/32.png) [@cjcoats](https://forum.cmascenter.org/u/cjcoats)\
**Post date:** [July 14, 2021, 2:54pm UTC](https://forum.cmascenter.org/t/could-not-read-densa-j-from-met-cro-3d/2507/2 "2021-07-14T14:54:57Z")

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Either (a) this is a bad MET\_CRO\_3D file (where did it come from?) or (b) it is for a time period that doesn’t contain the date&time 2017099:200000 (what does the log-message from opening this file say?), or (c) the variable `DENSA_J` isn’t in the file (which is another version of the “bad file” problem.