Issue using solution in Office 365

[Mathr001]

I have followed the information outlined in the documentation, and can test locally using gulp serve, package without issues. However when using the workbench on an Office 365 site or once deployed to Office 365 SharePoint Site, I get the following error when adding the web part to the page:

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If the problem persists, contact the site administrator and give them the information in Technical Details.
Technical Details
[SPLoaderError.loadComponentError]:
***Failed to load component "cadb7281-f135-4e1a-bd70-96cef45aeae7" (EmployeePerformanceAppWebPart).
Original error: ***Failed to load component dependency "cadb7281-f135-4e1a-bd70-96cef45aeae7" from component "EmployeePerformanceAppWebPart" (***Failed to load component "4d5eb168-6729-49a8-aec7-0e397f486b6e" (SPClientPreview).
Original error: ***loadComponent() returned an empty object for component "4d5eb168-6729-49a8-aec7-0e397f486b6e" (SPClientPreview).).
Original error: {3}

***INNERERROR:
***Failed to load component dependency "cadb7281-f135-4e1a-bd70-96cef45aeae7" from component "EmployeePerformanceAppWebPart" (***Failed to load component "4d5eb168-6729-49a8-aec7-0e397f486b6e" (SPClientPreview).
Original error: ***loadComponent() returned an empty object for component "4d5eb168-6729-49a8-aec7-0e397f486b6e" (SPClientPreview).).
Original error: {3}
***CALLSTACK:
Error
at t (https://spoprod-a.akamaihd.net/files/sp-client-prod_2018-11-02.006/sp-pages-assembly_en-us_f746ab36004a4ceadacc3dcfefbaa2af.js:843:15844)
at t (https://spoprod-a.akamaihd.net/files/sp-client-prod_2018-11-02.006/sp-pages-assembly_en-us_f746ab36004a4ceadacc3dcfefbaa2af.js:1719:22277)
at e.buildErrorWithVerboseLog (https://spoprod-a.akamaihd.net/files/sp-client-prod_2018-11-02.006/sp-pages-assembly_en-us_f746ab36004a4ceadacc3dcfefbaa2af.js:1719:16597)
at e.buildLoadComponentError (https://spoprod-a.akamaihd.net/files/sp-client-prod_2018-11-02.006/sp-pages-assembly_en-us_f746ab36004a4ceadacc3dcfefbaa2af.js:1719:12622)
at Anonymous function (https://spoprod-a.akamaihd.net/files/sp-client-prod_2018-11-02.006/sp-pages-assembly_en-us_f746ab36004a4ceadacc3dcfefbaa2af.js:1719:71700)