C1LB006E message is inconclusive, this FAQ outlines some possible reasons for the message.
Release: 18.0 18.1
Component: Endevor Software Change Manager
The 'C1LB006E library open failed' message does not supply information about the specific cause.
To diagnose the problem, investigate accompanying messages, for example a IEC161I, and the reported RC and SFI in that IBM message.
If the ELIB file is under L-Serv control, check the L-Serv log for LDM error messages.
Possible causes of this error are: