Problem validation Plugin: To use variable dimensions in code generation, the WeightsOutput property must be set to 'None'.

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I have a question.
I want to use the lms filter to compute output, error and weigths coefficient.
Why when I use the dsp.LMSFilter i cannot use the port WeightsOutput? In matlab its work, but when i try to validate the audioPlugin, there are some problem.
The error is : To use variable dimensions in code generation, the WeightsOutput property must be set to 'None'.
obj.lms1 = dsp.LMSFilter(300,'Method','LMS','StepSize',0.01,'LeakageFactor',0.99,'WeightsOutput','Last');
I think that is related to this. But without it I have errore related to the dimension.
coder.varsize('inputL','desired','filterOut','error',2^14);
Thanks you and sorry for my english

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