fatal error: unexpectedly found nil while unwrapping an Optional value error when I set barChartView.noDataText

[patcharaploy]

Hello experts,

I am totally new to this library. I tried to follow the tutorial: http://www.appcoda.com/ios-charts-api-tutorial/.
However after installing via cocoa pods the library to my project and type

barChartView.noDataText = "You need to provide data for the chart."

I got the EXEC_BAD_INSTRUCTION error as shown in the below image.

Please suggest me where I am wrong.

P.S. I already set the view inside of BarChartView as
Class: BarChartView
Module: Charts

P.S. Actually, the noDataTextDescription method and others also doesn't work.

[patcharaploy]

Sorry everyone, I got what I am wrong now.

[franigam]

And what is it?

[rivountain]

got same trouble...T_T...