For certain csar, vnfsdk csar-validate would fail with the following error message:

Validation issues:
0: document not found at URI: "onap_dm.yaml"
DocumentNotFoundException: document not found at URI: "onap_dm.yaml"
Traceback (most recent call last):
File "/home/lulianhao/onap/vnfsdk/pkgtools/venv/bin/vnfsdk", line 11, in <module>
load_entry_point('vnfsdk', 'console_scripts', 'vnfsdk')()
File "/home/lulianhao/onap/vnfsdk/pkgtools/vnfsdk_pkgtools/cli/_main_.py", line 116, in main
args.func(args)
File "/home/lulianhao/onap/vnfsdk/pkgtools/vnfsdk_pkgtools/cli/_main_.py", line 47, in csar_validate_func
driver.validate(reader)
File "/home/lulianhao/onap/vnfsdk/pkgtools/vnfsdk_pkgtools/validator/aria_validator.py", line 40, in validate
raise RuntimeError('Validation failed')
RuntimeError: Validation failed

I did some tests, find that if we put all tosca yaml file in the definitions directory in the csar file, it succeeds.