resolve underspecified signal dimensions

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Joe Jones on 7 Jul 2022

When I carry out the simulink, the MATLAB find an error which is as folllows:

Compilation of model 'abc' failed while trying to resolve underspecified signal dimensions.

Caused by:

Error in default port dimensions function of S-function 'abc/def/ghi/jkl'. This function does not fully set the dimensions of output port 2 .

How to solve this problem please? Thank you.

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