Here is the error that I am getting:

Slim Application Error The application could not run because of the following error:

Details

Type: Twig_Error_Syntax Message: The function "baseUrl" does not exist in "main.twig" at line 30 File: /home/treehouse/workspace/vendor/twig/twig/lib/Twig/ExpressionParser.php Line: 578 Trace

0 /home/treehouse/workspace/vendor/twig/twig/lib/Twig/ExpressionParser.php(351): Twig_ExpressionParser->getFunctionNodeClass('baseUrl', 30)

1 /home/treehouse/workspace/vendor/twig/twig/lib/Twig/ExpressionParser.php(144): Twig_ExpressionParser->getFunctionNode('baseUrl', 30)

2 /home/treehouse/workspace/vendor/twig/twig/lib/Twig/ExpressionParser.php(84): Twig_ExpressionParser->parsePrimaryExpression()

3 /home/treehouse/workspace/vendor/twig/twig/lib/Twig/ExpressionParser.php(41): Twig_ExpressionParser->getPrimary()

4 /home/treehouse/workspace/vendor/twig/twig/lib/Twig/Parser.php(141): Twig_ExpressionParser->parseExpression()

5 /home/treehouse/workspace/vendor/twig/twig/lib/Twig/Parser.php(95): Twig_Parser->subparse(NULL, false)

6 /home/treehouse/workspace/vendor/twig/twig/lib/Twig/Environment.php(606): Twig_Parser->parse(Object(Twig_TokenStream))

7 /home/treehouse/workspace/vendor/twig/twig/lib/Twig/Environment.php(658): Twig_Environment->parse(Object(Twig_TokenStream))

8 /home/treehouse/workspace/vendor/twig/twig/lib/Twig/Environment.php(396): Twig_Environment->compileSource('...', 'main.twig')

9 /home/treehouse/workspace/vendor/twig/twig/lib/Twig/Template.php(286): Twig_Environment->loadTemplate('main.twig', NULL)

10 /home/treehouse/workspace/vendor/twig/twig/lib/Twig/Environment.php(403) : eval()'d code(11): Twig_Template->loadTemplate('main.twig', 'about.twig', 1)

11 /home/treehouse/workspace/vendor/twig/twig/lib/Twig/Environment.php(411): TwigTemplate_87fa17a43c525a6dd65897900b8b7049d4e2de5230937e2da534aa1c8c9cd199->construct(Object(Twig_Environment))

12 /home/treehouse/workspace/vendor/slim/views/Twig.php(87): Twig_Environment->loadTemplate('about.twig')

13 /home/treehouse/workspace/vendor/slim/slim/Slim/View.php(255): Slim\Views\Twig->render('about.twig', NULL)

14 /home/treehouse/workspace/vendor/slim/slim/Slim/View.php(243): Slim\View->fetch('about.twig', NULL)

15 /home/treehouse/workspace/vendor/slim/slim/Slim/Slim.php(757): Slim\View->display('about.twig')

16 /home/treehouse/workspace/index.php(21): Slim\Slim->render('about.twig')

17 [internal function]: {closure}()

18 /home/treehouse/workspace/vendor/slim/slim/Slim/Route.php(468): call_user_func_array(Object(Closure), Array)

19 /home/treehouse/workspace/vendor/slim/slim/Slim/Slim.php(1357): Slim\Route->dispatch()

20 /home/treehouse/workspace/vendor/slim/slim/Slim/Middleware/Flash.php(85): Slim\Slim->call()

21 /home/treehouse/workspace/vendor/slim/slim/Slim/Middleware/MethodOverride.php(92): Slim\Middleware\Flash->call()

22 /home/treehouse/workspace/vendor/slim/slim/Slim/Middleware/PrettyExceptions.php(67): Slim\Middleware\MethodOverride->call()

23 /home/treehouse/workspace/vendor/slim/slim/Slim/Slim.php(1302): Slim\Middleware\PrettyExceptions->call()

24 /home/treehouse/workspace/index.php(28): Slim\Slim->run()

25 {main}