"Data column(s) for axis #0 cannot be of type string×"

Hello,

I just opened a new property for a manu.co.il minisite in google analytics and added your google analytics plugin.

Since the property is new, there are not statistics yet, but aside from that, on my minisite dashboard, where the google analytics display I see a red message saying:

"Data column(s) for axis #0 cannot be of type string×"

What is the problem? Does this means that I dind't install it properly? How should I fix it?

Thanks!