[MeshKit Error] ErrInvalidChartURI needs improvement

[leecalcote]

Proposed Change

       Enhance the ErrInvalidChartURI message to be more specific about filesystem and/or URL references

Originally posted by @leecalcote in #33 (comment)

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[rghdrizzle]

Hello, I can work on this. I have a question, I can't seem to find the function being called anywhere