Ionic collection-repeat issue

I used collection-repeat with md-grid-tile below,

<md-grid-tile collection-repeat="record in records" md-rowspan="1" md-colspan="1" md-colspan-sm="1" >
<!--- Rest of code --->

but when I run this, it will display error like this in console.

Error: collection-repeat tried to compute the height of repeated elements "record in records", but was unable to. Please provide the "item-height" attribute

Is there any way to fix this issue??