Problem:
After the install of CA Workload Automation System Agent was complete, no value was assigned to the "security.cryptkey=" parameter in the agentparm.txt file.
Workaround:
Check the unix/win_installer.properties file for the statement
STRONG_ENCRYPTION_FILE=$USER_INSTALL_DIR$$/$cryptkey.txt
If statement is not found - add one into the 'Strong Encryption' section and repeat the silent installation if needed.