Add Box Page errors: failed to open stream

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I am adding my own custom pages as per the manual and when I click on the link for my ergonomic.php page in my new "Style" box I get these errors:

 

Warning: main(includes/languages/english/ERGONOMIC): failed to open stream: No such file or directory in /home/content/html/ergonomic.php on line 15

 

Warning: main(includes/languages/english/ERGONOMIC): failed to open stream: No such file or directory in /home/content/html/ergonomic.php on line 15

 

Fatal error: main(): Failed opening required 'includes/languages/english/ERGONOMIC' (include_path='.:/usr/local/lib/php') in /home/content/html/ergonomic.php on line 15

 

 

What did I do wrong?

 

Thanks!