Error in Appendix G recipe

Grasshopper Plugin
1

I am testing out the Appendix G recipe, but I am getting the following error when running the recipe locally:

C:\Users\stef\AppData\Local\Temp\Pollination\Recipes\pollination_appendix-g-performance-0.3.7\run.py:101: DeprecationWarning: datetime.datetime.utcnow() is deprecated and scheduled for removal in a future version. Use timezone-aware objects to represent datetimes in UTC: datetime.datetime.now(datetime.UTC). now = datetime.datetime.utcnow().strftime(‘%Y-%m-%dT%H:%M:%SZ’)

can someone point towards what’s wrong?

Thanks! :slight_smile:

3

Hi @stepap,

The error you shared is just a warning. We are aware of this and are working on removing it from the recipes.

Did the component fail (turn red) or was it just this warning? To see the actual error that caused the recipe to fail we need to look into the log file. You should be able to find it in a path similar to this (I didn’t name my study so it uses “Unnamed”):

C:\Users\[USERNAME]\simulation\Unnamed\Unnamed\_logs_\logs.log

4

Hi Mikkel,

The err.log file reads the below:

*2026-08-12 13:13:29 ERROR: "RunProposedSimulation" failed.* 

*See below for more information:*

*Assigned template HVAC: FCU_DOAS_Enthalpy_Wheel*

The log.log file is quite long, but the end of it reads the below:

*Keep-Alive thread
2026-08-12 13:14:44 INFO:
===== Luigi Execution Summary =====*

*Scheduled 13 tasks of which:*

* *8 ran successfully:*
  * *1 CreateProposedSimPar(...)*
  * *1 CreateSimPar(...)*
  * *1 ModelToBaseline(...)*
  * *1 RunBaselineSimulations(...)*
  * *4 RunBaselineSimulationsLoop(...)*
* *1 failed:*
  * *1 RunProposedSimulation(...)*
* *4 were left pending, among these:*
  * *4 had failed dependencies:*
    * *1 ComputeAppendixGSummary(...)*
    * *1 ComputeLeedV4Summary(...)*
    * *1 LetAppendixGPerformanceFly(...)*
    * *1 \_Main_d4b4c630Orchestrator(...)*

*This progress looks :frowning: because there were failed tasks*

*===== Luigi Execution Summary =====*

Is there an issue with the assigned HVAC template? I am using the example file that Chris uploaded