WARNING:Warnings related to minor issues that are difficult to resolve will be logged for the following files

I met a problem when running this line: '''convert_rst_discourse_tb ~/corpora/rst_discourse_treebank ~/corpora/treebank_3‘’‘
`WARNING:Warnings related to minor issues that are difficult to resolve will be logged for the following files: file1.edus, file5.edus, wsj_0678.out.edus, and wsj_2343.out.edus. Multiple warnings 'not enough syntax trees' will be produced because the RSTDTB has footers that are not in the PTB (e.g., indicating where a story is written). Also, there are some loose match warnings because of differences in formatting between the treebanks.`
the rst_discourse_tb_edus_TEST.json & rst_discourse_tb_edus_TRAINING.json it generated is empty. I don't know why?
Anybody know how to fix it? @desilinguist