Ok i know thats it is the minecraft version of the modpack its calls all the minecraft version from the Minecraft Version API http://www.technicpack.net/api/minecraft
Here i have the Stack Trace: from the error:
C:/whatever/host/ <----------- This is the rootSolder in the code
c:/whatever/host/public_html/ <-------------- This is a example where i have my solder
#0 ......./public_html/laravel/laravel.php(42): LaravelError::native(2, 'Invalid argumen...', 'rootSolder...', 27)
#1 ......./public_html/laravel/view.php(386) : eval()'d code(27): Laravel{closure}(2, 'Invalid argumen...', 'rootSolder...', 27, Array)
#2 ......./public_html/laravel/view.php(386): eval()
#3 ......./public_html/laravel/blade.php(71): LaravelView->get()
#4 [internal function]: Laravel{closure}(Object(LaravelView))
#5 ......./public_html/laravel/event.php(199): call_user_func_array(Object(Closure), Array)
#6......./public_html/laravel/event.php(138): LaravelEvent::fire('laravel.view.en...', Array, true)
#7 ......./public_html/laravel/view.php(348): LaravelEvent::until('laravel.view.en...', Array)
#8......./public_html/laravel/view.php(590): LaravelView->render()
#9 ......./public_html/laravel/response.php(268): LaravelView->__toString()
#10 ......./public_html/laravel/laravel.php(180): LaravelResponse->render()
#11 ......./public_html/public/index.php(34): require('rootSolder...')
#12 {main}