Hello @Temitopeogunwola ,
>>cisco-stack1(config)#interface te 1/1/1
cisco-stack1(config-if)#no service-policy output BUFFERS
Warning: - removal of service policy will cause inconsistency with TenGigabitEthernet4/1/1 in ether channel 1
As far I can understand the interface te1/1/1 is part of etherchannel 1 together with te4/1/1 in your C9200 stack.
IF the etherchannel 1 bundle is already working you must change the configuration in interface port-channel 1 mode, you should not try to change the configuration of a member link.
This is very important as it can have an impact on your network as one link or even both member links can go to errordisable state.
As noted above for links part of a working bundle make the changes in port-channel X interface
Hope to help
Giuseppe