Check Multiple elements by category for parameter existence

Revit
1

Hi,
I am trying to check all the wall elements present in the model has required parameters value or not, but the code only checks first element obtained from all elements of category that is in this case 0 Wall 198694 and not the other wall element. Is there any way to check all wall elements instead of only first one. I am unable to share the dynamo file and excel as it says I am a new user hence I have attached a drive link below.

https://drive.google.com/drive/folders/0B-J9MpPvFY6CYkZkZFlra1VKMEE?usp=sharing

Parameter has value.jpg1524×766 326 KB

2

You could start here: http://dynamoprimer.com/en/06_Designing-with-Lists/6-1_whats-a-list.html and read up on lacing.

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