Import problem of Google map widget

Hi, there

I am facing an error to import Google map widget [ context: Extension Exception][message: Extension must have a metadata.xml file.]. I have already create API key and paste it into the metadata.xml.

I am following this link for google map widget : https://www.ptc.com/en/support/article?n=CS188314

I am attached metadata.xml given below.

Please help me i am begineer at the thingworx