I want to use libnetconf2 to write netconf-client to interact with confd, but there is no tail-common in the session, so I load it manually, but the above error occurs during the load, please help analyze, thank you
To me this looks like a problem in the libyang tool. As far as I can tell, tailf-common and its submodules are syntactically correct; and libyang’s error message does not tell much to try to identify where any problem might be.
But there should be no need to provide tailf-common module to your toolset. You can either:
remove all tailf:XXX annotations from your modules before providing them to libyang, either manually or using pyang -f yang --tailf-sanitize ...;
longer-term solution: move all your tailf:XXX annotations from your modules to annotation modules (typically named like <MODULE>-ann.yang; see how they are used in some of the confd examples.