undefined is not an object (evaluating 'items.forEach')

[Rashhh]

this error is coming in groupItems index.js 16, I am using react native version 0.37 and react 15.3.2

[slimeygecko]

Make sure you have all of the props passed in correctly. You need to have the dataSource property set with data.

[ghost]

Same issue here. Looking for another component

[khiconit]

Same issues here

[JaeHeyK]

Same issues here.

[bharathdoijode]

if you are using cloneWithRows while assigning to dataSource, comment it and assign the values directly to dataSource like

dataSource: data

instead of
dataSource: ds.cloneWithRows(data)

hope it helps!