RegCM5 with ERA5 ICBC: forcing height vs canopy height error

[RohtashS]

I am using the RegCM5 model to simulate an extreme rainfall event and am attempting to use hourly ERA5 data as the global forcing for ICBC.
I downloaded the ERA5 data using the scripts recommended in the RegCM documentation. I was able to generate ICBC files and start the model, but the simulation stops during CLM initialization with the following error:
Error: Forcing height is below canopy height for pft index 487158
-------------- FATAL CALLED ---------------
Fatal in file: mod_clm_canopyfluxes.F90 at line: 980
clm now stopping

Abort called by computing node 5 at 2026-02-06 12:59:56 -0500
Execution terminated because of runtime error
I have two main questions:
Is there a standard or recommended workflow to make ERA5 input data fully compatible with RegCM5 (particularly for ICBC and land–atmosphere coupling with CLM4.5)?
What is the recommended way to resolve the “forcing height is below canopy height” error in CLM? Specifically, I would like to understand whether this issue is typically related to: surface dataset generation (mksurfdata), namelist configuration (e.g., forcing height settings), or inconsistencies between atmospheric forcing and land surface parameters.
Any guidance or suggestions would be greatly appreciated.