The application could not run because of the following error:
#0 [internal function]: Slim\Slim::handleErrors(2, 'Cannot modify h...', '/home/timotheej...', 580, Array)#1 /home/timotheejd/www/api/ASNcrash/functions.php(580): header('Content-Type: t...')#2 /home/timotheejd/www/api/ASNcrash/index.php(57): export_csv(-1)#3 [internal function]: {closure}()#4 /home/timotheejd/www/api/Slim/Route.php(468): call_user_func_array(Object(Closure), Array)#5 /home/timotheejd/www/api/Slim/Slim.php(1357): Slim\Route->dispatch()#6 /home/timotheejd/www/api/Slim/Middleware/Flash.php(85): Slim\Slim->call()#7 /home/timotheejd/www/api/Slim/Middleware/MethodOverride.php(92): Slim\Middleware\Flash->call()#8 /home/timotheejd/www/api/Slim/Middleware/PrettyExceptions.php(67): Slim\Middleware\MethodOverride->call()#9 /home/timotheejd/www/api/Slim/Slim.php(1302): Slim\Middleware\PrettyExceptions->call()#10 /home/timotheejd/www/api/ASNcrash/index.php(94): Slim\Slim->run()#11 {main}