JTextArea is disabled and I can't Enable it

I created a class and added some Swing elements to make an application, then using the drag and drop JPanel from netbeans, I made the same application, copied the codes concerning the layout to the original class, changed the variable names so they can work in layout, and they did, I got the same layout, in the drag and drop application, I added a JTextArea, but in source codes, it adds a