Export all conditional text iterations to a pdf

I have a document with over 70 pages of images that need 20 different text combinations for each page. I have my conditional text all set up and was looking for a way to easily export all the different combinations to a .pdf.

I found this post which is exactly what I want to do. Here is the script from the post:

var nameOfThePDFExportPresetYouWantToUse = '[High Quality Print]' //please don't forget to set!

var currDoc = app.activeDocument;

var currFilePath = currDoc.filePath.absoluteURI + '/';

var currFileName = currDoc.name.replace(/.indd/, '');

var currConditions = currDoc.conditions;

//set all conditions visible to false

currConditions.everyItem().visible = false;

l = currConditions.length;

//cycle thru conditions

while(l--){

currCondition = currConditions;

//set actual condition visible to true

currCondition.visible = true;

currConditionName = currCondition.name

//set pdfName

var exportTo = File(currFilePath + currFileName + '_' + currConditionName +'.pdf');

//Have a look here:

//export PDF. to choose backgroundexport. use the second line of code

currDoc.exportFile(ExportFormat.PDF_TYPE, exportTo,false, nameOfThePDFExportPresetYouWantToUse);

//currDoc.asynchronousExportFile(ExportFormat.PDF_TYPE, exportTo,false, nameOfThePDFExportPresetYouWantToUse);

//set actual condition visible to false

currCondition.visible = false;

}

I copied the script from this post, but am getting the following error when I try to run it:

Error Number: 55

Error String: Object does not support the property or method 'visible'

I am a complete novice when it comes to scripting, so I am unable to trouble shoot it at all. The error line is in orange. Any help would be appreciated!