Connection to merge block was invalid

Simulink error as below:

The connection from 'Runnable_CTRL/...../CtrlStateMachine' 'Output Port 1' to 'Runnable_CTRL/CtrlDecision_swc/...ModeMerge/Merge' input port 2 is invalid. Signals being merged can only be connected to a Merge input port, must map to a unique element of the Merge block, and should not be connected to any other block input ports

[Brahmadev]

Hi chen,

Have you checked out: https://in.mathworks.com/matlabcentral/answers/101455-is-it-possible-to-connect-the-input-signal-of-the-merge-block-to-other-blocks-in-simulink?s_tid=answers_rc1-1_p1_Topic

Do let me know if this does not resolve your issue.