Add On Browser File Prewiew For Creatio

first of all, my requirement is to make 3 pages of the record, the first one is the list page, the second one is the form page, and the third is the view page, the form page is shown when i click the add new button in list page, and the view page is shown when i click the record, and i have an issue on one of the following page.


i have written code page using a feature preview from add on plugins in my form page and this is my code, 


but when i try to make the same code on my view page, the preview button didnt work, this is my code