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roscore error, ROS_MASTER_URI

Hello! Everyone. I have encountered an roscore error. When I run roscore, the screenshot is presented as follows.

image description

I only open a terminal, and thus I am sure I do not run another roscore. Besides, when I run roslaunch, it does not print an error, but all wait. I guess whether the ROS_MASTER_URT set is right or not. Thanks in advance and best regards. The error is further presented as bleow.

roscore cannot run as another roscore/master is already running. Please kill other roscore/master processes before relaunching. The ROS_MASTER_URI is http://yxg-Inspiron-5443:11311/ The traceback for the exception was written to the log file

roscore error, ROS_MASTER_URI

Hello! Everyone. I have encountered an roscore error. When I run roscore, the screenshot is presented as follows.

follows.

image description

I only open a terminal, and thus I am sure I do not run another roscore. Besides, when I run roslaunch, it does not print an error, but all wait. I guess whether the ROS_MASTER_URT set is right or not. Thanks in advance and best regards. The error is further presented as bleow.

roscore cannot run as another roscore/master is already running. 
Please kill other roscore/master processes before relaunching.
The ROS_MASTER_URI is http://yxg-Inspiron-5443:11311/
The traceback for the exception was written to the log file

file