[TestComplete] Test runner exit code: 259.

I m facing weird  failure suddenly while executing suite via test execute

Please Help on this

please find below error:

$ '"C:\Program Files (x86)\SmartBear\TestExecute 12\bin\TestCompleteService12.exe"' //LogonAndExecute //lDomain: "" //lName: "Administrator" //lPassword: ******** //lTimeout: "-1" //lUseActiveSession: "true" //lCommandLine: '""C:\Program Files (x86)\SmartBear\TestExecute 12\x64\bin\TestExecute.exe" c:\jenkins\workspace\setup-environment-fresh\cmp\testcomplete\Nectar_Automation_Project\Nectar_Automation_Framework.pjs /run /SilentMode /ForceConversion /ns /exit /ExportLog:c:\jenkins\workspace\setup-environment-fresh\1565710646742.tclogx /ExportLog:c:\jenkins\workspace\setup-environment-fresh\1565710646742.htmlx /ErrorLog:c:\jenkins\workspace\setup-environment-fresh\1565710646742.txt /DoNotShowLog UserInputsPath:c:\jenkins\workspace\setup-environment-fresh/userconfig /JenkinsTCPluginVersion:2.1"'
[TestComplete] Test runner exit code: 259.
[TestComplete] [WARNING] Unable to find the log file "1565710646742.tclogx".
[TestComplete] [WARNING] Unable to find the log file "1565710646742.htmlx".
[TestComplete] [WARNING] Errors occurred during the test execution.
[TestComplete] The test execution finished (Nectar_Automation_Framework).