I can’t get the de-serialise component to read text from a text component but I can get it to read once the text from that component has been copied over to a text panel.
I’m at home now with only a tablet, so I can’t open your file, but the wire from the text parameter is double, meaning more than one piece of text is flowing through it. Could it be that your text parameter contains all the lines individually, instead of all together as a single block of text?
These blocks separately are not correct JSON, hence the error message. Not sure how you managed to seed this parameter component with the data like this.
If you intend to get the same text of the panel in the text parameter you should make it into one long string, something along the lines of