Custom vis and plugin error

hi all, i installed visualization and plugin with the guide "https://www.elastic.co/blog/developing-new-kibana-visualizations" from the github at the end of the topic(https://github.com/elastic/kibana_sample_visualization and https://github.com/elastic/kibana_sample_plugin).
and got the error " Kibana did not load properly. Check the server output for more information.", but saw everywhere and found nothing . command line shows no errors.
I use development environment of kibana.

Hello,
If you're using a kibana version >6.3, this is current way to generate a sample plugin:

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