Unable to insert a macro from the Edit Skins Panel tab.

• Install ThemeBuilder 5.7.6 from the marketplace onto a 6.15.1 Ready Confluence box. (I used docker) 
• Create a skin so you are able to edit one of the panels. 
• Now with the skin created, select this skin then navigate to the panels tab. 
• Open the content panel and attempt to add a macro using the "Insert Macro" button on the top left. 
• Select any Themebuilder macro, e.g 'Generate Page Link' and select. 
• Like the attached image, you will see a continous spinner with the macro window unable to load due to an uncaught type error " No confluence-editor-v4/build/editor " 

STACKTRACE

Uncaught Error: No confluence-editor-v4/build/editor
at r (batch.js?locale=en-GB:50)
at i (batch.js?locale=en-GB:53)
at batch.js?locale=en-GB:151
at s (batch.js?locale=en-GB:52)
at r (batch.js?locale=en-GB:50)
at i (batch.js?locale=en-GB:53)
at Object.loadMacroInBrowser (batch.js?healthcheck-resources=true&hostenabled=true&locale=en-GB:1464)
at Object.successCallback [as success] (batch.js?healthcheck-resources=true&hostenabled=true&locale=en-GB:1513)
at k (batch.js?locale=en-GB:203)
at Object.fireWith [as resolveWith] (batch.js?locale=en-GB:204)