I replace the $PATH position and it's worked! Thank you so much!

thanks again.
I add 'HOUDINI_DSO_ERROR = 2' to houdini.env file. and says that.

thanks for reply. Octane V4 Standalone works fine on my system. and I think houdini.env PATH variable is fine too. because Octane_3.08.1.0_Houdini_16.5.496_Win64 is worked fine.

I can‘t add Octane in out, and Octane 3.08.1.0 is worked fine.

i add this in houdini.env