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Why framed mode simlinkCoupler reports error in AMS-MATLAB co-simulation

SpiceMonkey

It works well if I use unframed mode. When I use framed mode, SimCoupler reports error:

Error in block 'untitled/SimulinkCoupler': ERROR (SIMLNK-48): An unframed signal cannot be connected to the input port 0 (counting from 0) while the s-function parameter Frame mode is set to 'framed'.
Ensure that all blocks connected to the coupler are either all framed or all unframed.Error reported by S-function 'SimCoupler' in 'untitled/SimulinkCoupler':
ERROR (SIMLNK-48): An unframed signal cannot be connected to the input port 0 (counting from 0) while the s-function parameter Frame mode is set to 'framed'.
Ensure that all blocks connected to the coupler are either all framed or all unframed.

This is my Simulink test bench, I have use [Buffer] to convert [Sine Wave]'s sampled signal to be framed one. Could anyone help?

(simCoupler.mdl and mex files are form IC618, Matlab 2021b)

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