disturbing error message in MT4

do some one know why I keep getting this message in MT4?
what does it mean? how can I make it go away
so I can backtest my EA properly?

Your price data has inconsistencies which could be from a number of causes. Anyway, somehow your historical bar data has become corrupted.

The best thing to do is go into your history folder, delete the data and refresh the data or import 1 minute data from a source such as
http://www.forextester.com/data/datasources.html

Thanks for the tip, I will try that

At the very least (without importing 1 minute data from an external source) you can delete your data in the history directory and refresh the bars from your broker. So what you'd do is open a chart for say EURUSD, go to each time frame (M1, M5, etc) and right mouse click on the chart and select refresh. This will get data as far back as your broker's backfill will go. For M1 it'll only go back a few days/weeks. For D1 it might go back years.