Markdown split doesn't work


how can i use markdown_split template?
i've done 
```
ansible -m setup --tree cmdb/ all
```
and after use this
```
root@automation:~# ansible-cmdb  -t markdown_split cmdb/ markdown/
Error parsing: mobile.md: No JSON object could be decoded
Error parsing: mobile02.md: No JSON object could be decoded
```
so how can i use it?