Thinkphp template output problems

The thinkphp template outputs a question. a SearchAction contains multiple methods, including the index () method, search () method, and choose () method. The form submitted to the search () method can be displayed normally. an error is returned using the index or choose method. & Nbsp; the three methods are correct. When outputting a Template: & nbsp; $ this-thinkphp template output problems
A SearchAction contains multiple methods, including the index () method, search () method, and choose () method. The form submitted to the search () method can be displayed normally. an error is returned using the index or choose method. There is no problem with these three methods. When outputting a template:
$ This-> display (); an error is returned when this sentence is used. the template cannot be found.
$ This-> show ('OK'); with this statement, OK is displayed. no error is reported, but only OK is displayed.
What's going on? What statement should I use? The thinkphp template output is shared:
------ Solution --------------------
Please post your error message.