We are looking into a change made by the Adobe Phone Gap Build Service that is affecting the use of plugins. In the meantime:

If you do not require the 'File transfer' plugin, uncheck 'File transfer' in the 'App Plugins'

or:

If you do require the 'File transfer' plugin, uncheck 'File' and 'File transfer' in the 'App Plugins'. Then add the following in the 'Others':

cordova-plugin-file" spec="4.3.3;cordova-plugin-file-transfer" spec="1.6.3

(the non-matching quotes should be entered as above)

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