# GW followed by a DFT+U\_Run error

**URL:** <https://discourse.abinit.org/t/gw-followed-by-a-dft-u-run-error/3577>\
**Category:** Ground state\
**Created:** [August 31, 2024, 1:17am UTC](https://discourse.abinit.org/t/gw-followed-by-a-dft-u-run-error/3577 "2024-08-31T01:17:06Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Bijoy](https://discourse.abinit.org/letter_avatar_proxy/v4/letter/b/e5b9ba/32.png) [@Bijoy](https://discourse.abinit.org/u/Bijoy)\
**Post date:** [August 31, 2024, 1:17am UTC](https://discourse.abinit.org/t/gw-followed-by-a-dft-u-run-error/3577/1 "2024-08-31T01:17:06Z")

</div>

I am using Abinit Verson 9.4.2. Now, during the **GW calculation followed by a DFT+U** calculation, I found an **error**. That is  
“ **NetCDF library returned: NetCDF: Variable not found while trying to get the ncid of a variable: vUme.** ”

**I am explaining the steps I followed for this calculation.**

1. I did a self-consistant calculation defining u pawu, j pawu, and the density matrix.  
2: Using the density file of the previous calculation, we did a nSCF calculation by defining u pawu, j pawu, and density matrix as DFT+U parameters.
2. Using the wavefunction file from the previous calculation, we did a SCR calculation by defining u pawu and j pawu. but not defining the density matrix.  
4: Using the SCR file and the Wavefunction file, I tried to do the GW run by defining u pawu and j pawu. but not defining the density matrix.

Please help me to troubleshoot this problem.