Misleading error message for missing .yml file

[jbednar]

[philippjfr]

Will be huge ordeal to improve that since it's many layers deep inside bokeh.

[jbednar]

Can we put in a test earlier to short circuit it, i.e. explicitly check if the .yml file exists?

[philippjfr]

I'd strongly favor making a suggestion for improving the bokeh error message. To my eyes it's relatively clear.

[jbednar]

My suggestion would be "File not found: C:\Users\Chris\dashboard.yaml". I have to infer from "Path" and "Bokeh server application" that it's saying that the file is not found; it isn't saying "file" and "Bokeh server application" sounds like it's about some internal browser machinery, not my Lumen app. Focusing on the actual specific problem, i.e. that it's trying to load a file and not finding it, seems like the way to communicate here.

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