Hi, can you provide the link to the tutorial you are working through and any specific details about the error (screenshot, full error message, etc.)? You can also try to ask any Power BI questions in the Power BI forums here:
http://community.powerbi.com/
Thanks,
Sam Lester (MSFT)
https://blogs.msdn.microsoft.com/samlester/
Twitter - @SQLSamLester
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