Check the log file at '/usr/local/flamenco/instances/Reference-Library_-_19-02-06/log.txt' for more details. Here are the last few lines:
ReportRPCExceptionsInWebKit = 1
SaveErrorMessages = 1
SessionPrefix = None
SessionStore = Dynamic
SessionTimeout = 60
ShowDebugInfoOnErrors = 1
UnknownFileTypes = {'Technique': 'serveContent', 'ReuseServlets': 1, 'CacheContent': 1, 'CheckDate': 1}
UseAutomaticPathSessions = 0
UseCascadingExtensions = 1
UserErrorMessage = The site is having technical difficulties with this page. An error has been logged, and the problem will be fixed as soon as possible. Sorry!
Loading context: default at /usr/local/flamenco/python
Current directory: /usr/local/flamenco/instances/Reference-Library_-_19-02-06
Session Sweeper started
Plug-ins list: /usr/local/flamenco/webware/MiddleKit, /usr/local/flamenco/webware/MiscUtils, /usr/local/flamenco/webware/COMKit, /usr/local/flamenco/webware/TaskKit, /usr/local/flamenco/webware/UserKit, /usr/local/flamenco/webware/PSP, /usr/local/flamenco/webware/WebUtils
Loading plug-in: MiddleKit at /usr/local/flamenco/webware/MiddleKit
Loading context: MKBrowser at /usr/local/flamenco/instances/Reference-Library_-_19-02-06/../../webware/MiddleKit/WebBrowser
Loading plug-in: MiscUtils at /usr/local/flamenco/webware/MiscUtils
Loading plug-in: COMKit at /usr/local/flamenco/webware/COMKit
Plug-in /usr/local/flamenco/webware/COMKit cannot be loaded because:
Required op sys is ['nt'], but actual op sys is posix.
Loading plug-in: TaskKit at /usr/local/flamenco/webware/TaskKit
Loading plug-in: UserKit at