Hi,

Getting this error when launching Windows 20.5.445 and renderman 26.2:

WARNING: (MainThread) txmgr_houdini init_manager: Failed to create TxManager: Error: Loading the OCIO profile 'C:/PROGRA~1/Side Effects Software/Houdini 20.5.445/packages/ocio/houdini-config-v2.1.0_aces-v1.3_ocio-v2.3.ocio' failed. This .ocio config 'C:/PROGRA~1/Side Effects Software/Houdini 20.5.445/packages/ocio/houdini-config-v2.1.0_aces-v1.3_ocio-v2.3.ocio' is version 2.3. This version of the OpenColorIO library (2.2.1) is not able to load that config version.
The minor version 3 is not supported for major version 2. Maximum minor version is 2.

Is there a solution to this? A simple path statement or changing the installed OCIO version?

TIA

Yep... according to documentation RFH is basically not compatible with the ocio config that houdini comes with...
You will need to change it to 2.2
https://github.com/AcademySoftwareFoundation/OpenColorIO-Config-ACES/releases [github.com]
Will like to help more but that as far as I got I am surprised Renderman devs do not provide more info on how to set up this considering that they are suppose to support houdini installations.

So After digging a bit more to solve the error you could use the ocio config file that comes with RMAN. You can do that by adding the folloring lines to the package json file:
{ "OCIO": "c:/Program Files/pixar/RenderManProServer-26.2/lib/ocio/ACES-1.3/config.ocio" }