Thank you for the information.
I changed as described but I only see a blank empty page - no errors or HTML code.
if I "vardump" $app in index.php i get the following output which is displayed:
object(CodeIgniter\CodeIgniter)#8 (12) { ["startTime":protected]=> float(1575458255.783) ["totalTime":protected]=> NULL ["config":protected]=> object(Config\App)#6 (29) { ["baseURL"]=> string(30) "https://www.grubaer-it.at/ci4/" ["indexPage"]=> string(9) "index.php" ["uriProtocol"]=> string(11) "REQUEST_URI" ["defaultLocale"]=> string(2) "en" ["negotiateLocale"]=> bool(false) ["supportedLocales"]=> array(1) { [0]=> string(2) "en" } ["appTimezone"]=> string(13) "Europe/Vienna" ["charset"]=> string(5) "UTF-8" ["forceGlobalSecureRequests"]=> bool(false) ["sessionDriver"]=> string(40) "CodeIgniter\Session\Handlers\FileHandler" ["sessionCookieName"]=> string(10) "ci_session" ["sessionExpiration"]=> int(7200) ["sessionSavePath"]=> string(52) "/home/.sites/41/site4229539/web/ci4/writable/session" ["sessionMatchIP"]=> bool(false) ["sessionTimeToUpdate"]=> int(300) ["sessionRegenerateDestroy"]=> bool(false) ["cookiePrefix"]=> string(0) "" ["cookieDomain"]=> string(0) "" ["cookiePath"]=> string(1) "/" ["cookieSecure"]=> bool(false) ["cookieHTTPOnly"]=> bool(false) ["proxyIPs"]=> string(0) "" ["CSRFTokenName"]=> string(14) "csrf_test_name" ["CSRFHeaderName"]=> string(12) "X-CSRF-TOKEN" ["CSRFCookieName"]=> string(16) "csrf_cookie_name" ["CSRFExpire"]=> int(7200) ["CSRFRegenerate"]=> bool(true) ["CSRFRedirect"]=> bool(true) ["CSPEnabled"]=> bool(false) } ["benchmark":protected]=> NULL ["request":protected]=> NULL ["response":protected]=> NULL ["router":protected]=> NULL ["controller":protected]=> NULL ["method":protected]=> NULL ["output":protected]=> NULL ["path":protected]=> NULL ["useSafeOutput":protected]=> bool(false) }
