This error may be caused by an incorrect icatype parameter setting in the pop_runica function. The icatype argument specifies the type of the ICA algorithm, which can be 'runica', 'fastica', or 'binica', and the argument you passed in when calling the pop_runica function is 'fastica', which is correct.
in addition, you can also check the matlab. The UI. Internal. Dialog. FolderChooser/doShowDialog function is properly called, and whether the incoming of the correct parameters.