Parsing error at ACS - connected to openWRT/easycwmp

[abkhan]

I have OpenWRT/easycwmp as CPE client.
PerlACS - fresh install.
After connection, inform/informResponse is exchanged (although PerlACS complains about "missing SOAPAction header in message from cpe).
Then CPE send GetRPCMethod.
ACS shows error;

state without DeviceId, using old one.

YAML Error: Couldn't open param.yaml for input:\n no such file or directory.
Code: YAML_LOAD_ERR_FILE_INPUT
at /usr/share/perl5/YAML.pm line 71
Found store plugins: CWMP::Store::YAML, .....

Also I see text:
Use of uninitalized value $uid in concatenation (.) or string at lib/cwmp/Store/YAML.pm line 29, line 7.
-- This could be the result of error as there was no mention of error there.

No response is sent by ACS (may be a 500 should be there) and closes the connection.