Uncaught SyntaxError: Unexpected token I in JSON at position 0 (Error received after selecting Invoice and then validating POS payment (Odoo9))

Question

Uncaught SyntaxError: Unexpected token I in JSON at position 0http://192.168.100.8:8069/pos/web/:1Traceback: SyntaxError: Unexpected token I in JSON at position 0 at JSON.parse (<anonymous>) at HTMLIFrameElement.<anonymous> (http://192.168.100.8:8069/web/content/20979-9f1941e/web.assets_common.js:2552:379) at HTMLIFrameElement.dispatch (http://192.168.100.8:8069/web/content/20979-9f1941e/web.assets_common.js:740:451) at HTMLIFrameElement.elemData.handle (http://192.168.100.8:8069/web/content/20979-9f1941e/web.assets_common.js:713:173)

Error received after selecting Invoice and then validating POS payment (Odoo9)

Bruno Stuyts · Answer

I ran into a similar problem after installing wkhtmltopdf on a Google Cloud Image of Odoo 9.
The fix was to install node-less
$ sudo apt-get install node-less

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