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We also had a similar issue. We had tried endlessly to attempt the owners solutions however to no avail. Please see this issue and let me know about your findings: https://github.com/chartjs/chartjs-plugin-zoom/issues/73.
The issue occurs since RequireJS expects libraries to omit .js and therefore the Module ID chart.js will not load appropriately.
Regarding the error on line 11, we also replicated that issue and our conclusion was that chart was not loaded correctly.
Source:stackexchange.com