How can I get rid of this error message?

[Jean Armstrong443]

I am constantly getting this message no matter what I am doing or which browser I use. This site can’t be reached Check if there is a typo in app.popcart.com. If spelling is correct, try running Windows Network Diagnostics. DNS_PROBE_FINISHED_NXDOMAINI clicked on windows network diagnostics and the problem could not be found. I checked to see if I have an app called popcart and I don't see one. This is driving me crazy!I am not particularly tech savy so am at a loss. Can anyone help?

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