couldn't find footage named 'TextProperty', an expression was disabled as a result of an error

[岳瑠5C73]

Hello All,

I have a project using jason file. It uses footage and datavalue script to get the value in json file. 

json=thisComp.layer("jsonfilename").text.sourceText;
val1=thisComp.layer("a").text.sourceText;
val2=thisComp.layer("b").text.sourceText;
footage(json).dataValue([val1,val2]);

But somehow I receive an error "couldn't find footage named 'TextProperty', an expression was disabled as a result of an error" in the 4th line of the script. Please help.

[John T Smith]

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[岳瑠5C73]

Thank you for your advice. 
I am using Adobe CC After Effect 2021. My OS is windows 10 home. I am tyring to use expression in after effect but not working. 

[John T Smith]

To ask in the forum for your program please start at https://community.adobe.com/