Isaac sim 2021.2:import URDF to another environment come with ERROR

Hi,when I import a URDF to a environment , isaac sim reports errors.the error is following:
the logs is in bottom.I want some help.thank you

[Error] [omni.kit.commands.command] Failed to execute a command: URDFParseAndImportFile.
<class ‘pxr.Tf.ErrorException’>
Error in ‘pxrInternal_v0_20__pxrReserved__::CreateNewLayer’ at line 721 in file /buildAgent/work/ca6c508eae419cf8/USD/pxr/usd/usd/stage.cpp : ‘Failed to CreateNew layer with identifier ‘omniverse://localhost/Isaac/Environments/Simple_Room/turtlebot3_burger/turtlebot3_burger.usd’’
2022-05-05 13:48:58 [295,742ms] [Error] [omni.ui.python] ErrorException:
Error in 'pxrInternal_v0_20__pxrReserved
_::UsdStage::Open’ at line 867 in file /buildAgent/work/ca6c508eae419cf8/USD/pxr/usd/usd/stage.cpp : ‘Failed to open layer @omniverse://localhost/Isaac/Environments/Simple_Room/turtlebot3_burger/turtlebot3_burger.usd@’