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adb android shell sockets tcp

could not connect to tcp:5037: cannot connect to 127.0.0.1:5037: No connection could be made because the target machine actively refused it. (10061)

Hi I am new to android I am not able to run adb.exe it gives me below error:

==>adb start-server
adb I 6108 5748 adb.cpp:219] Android Debug Bridge version 1.0.32
adb I 6108 5748 adb.cpp:219] Revision 09a0d98bebce-android
adb I 6108 5748 adb.cpp:219]
adb I 6108 5748 adb_client.cpp:126] _adb_connect: host:version
adb I 6108 5748 sysdeps_win32.cpp:742] could not connect to tcp:5037: cannot connect to 127.0.0.1:5037: No connection could be made because the target machine actively refused it. (10061)
adb I 6108 5748 adb_client.cpp:175] adb_connect: service host:start-server
* daemon not running. starting it now on port 5037 *
Cannot open 'nul': The system cannot find the file specified. (2)
* failed to start daemon *
error: cannot connect to daemon

What does this error exactly mean..?

Cannot open 'nul': The system cannot find the file specified. (2)  

What is this error..?