XF 2.0 Error upon upgrade to 2.0.4

[Matt C.]

I finished upgrading to 2.0.4, and I get the following error when trying to access my site. I've uploaded all the files twice.

An exception occurred: [Error] Class 'Less_Tree_Expression' not found in src/vendor/oyejorge/less.php/lib/Less/Parser.php on line 2702

Less_Parser->NewObj1() in src/vendor/oyejorge/less.php/lib/Less/Parser.php at line 2579
Less_Parser->parseExpression() in src/vendor/oyejorge/less.php/lib/Less/Parser.php at line 2362
Less_Parser->parseValue() in src/vendor/oyejorge/less.php/lib/Less/Parser.php at line 858
Less_Parser->MatchFuncs() in src/vendor/oyejorge/less.php/lib/Less/Parser.php at line 2062
Less_Parser->parseRule() in src/vendor/oyejorge/less.php/lib/Less/Parser.php at line 858
Less_Parser->MatchFuncs() in src/vendor/oyejorge/less.php/lib/Less/Parser.php at line 1009
Less_Parser->parsePrimary() in src/vendor/oyejorge/less.php/lib/Less/Parser.php at line 674
Less_Parser->GetRules() in src/vendor/oyejorge/less.php/lib/Less/Parser.php at line 621
Less_Parser->_parse() in src/vendor/oyejorge/less.php/lib/Less/Parser.php at line 449
Less_Parser->parse() in src/XF/CssRenderer.php at line 337
XF\CssRenderer->parseLessColorValue() in src/XF/Template/Templater.php at line 2741
XF\Template\Templater->fnParseLessColor()
call_user_func_array() in src/XF/Template/Templater.php at line 879
XF\Template\Templater->fn() in internal_data/code_cache/templates/l1/s26/public/PAGE_CONTAINER.php at line 376
XF\Template\Templater->{closure}() in src/XF/Template/Templater.php at line 1248
XF\Template\Templater->renderTemplate() in src/XF/Pub/App.php at line 449
XF\Pub\App->renderPageHtml() in src/XF/App.php at line 1726
XF\App->renderPage() in src/XF/Mvc/Dispatcher.php at line 310
XF\Mvc\Dispatcher->render() in src/XF/Mvc/Dispatcher.php at line 44
XF\Mvc\Dispatcher->run() in src/XF/App.php at line 1891
XF\App->run() in src/XF.php at line 328
XF::runApp() in index.php at line 13

Any help would be appreciated. Thank you.

Edit: This is resolved. For some reason, uploading the entire src folder wasn't uploading certain files. I had to upload the specific folders individually.