diff --git a/conlib/local.php b/conlib/local.php
index b15c158..9adde42 100644
--- a/conlib/local.php
+++ b/conlib/local.php
@@ -41,6 +41,7 @@ if (!defined('CON_FRAMEWORK')) {
  * DB-class for all DB handling
  */
 class DB_ConLite extends DB_Sql {
+    protected bool $NoRecord;
 
     /**
      * Constructor of database class.
diff --git a/conlite/classes/class.htmlelements.php b/conlite/classes/class.htmlelements.php
index c20f353..c539b47 100644
--- a/conlite/classes/class.htmlelements.php
+++ b/conlite/classes/class.htmlelements.php
@@ -866,6 +866,7 @@ class cHTMLRadiobutton extends cHTMLFormElement {
      * @access private
      */
     var $_value;
+    protected string $_labelText;
 
     /**
      * Constructor. Creates an HTML radio button element.
diff --git a/setup/dbupdate.php b/setup/dbupdate.php
index 5b0065d..4b9b409 100644
--- a/setup/dbupdate.php
+++ b/setup/dbupdate.php
@@ -253,6 +253,4 @@ function txtFileToArray($sFile) {
         $aFileArray = explode("\n", file_get_contents($sFile));
     }
     return $aFileArray;
-}
-
-?>
\ No newline at end of file
+}
\ No newline at end of file
diff --git a/setup/lib/class.setupcontrols.php b/setup/lib/class.setupcontrols.php
index 2913f76..35b1ee3 100644
--- a/setup/lib/class.setupcontrols.php
+++ b/setup/lib/class.setupcontrols.php
@@ -33,9 +33,9 @@
  	
 
 class cHTMLAlphaImage extends cHTMLImage {
-    public $_sClickImage;
-    public $_sMouseoverClickImage;
-    public $_sMouseoverSrc;
+    protected $_sClickImage;
+    protected $_sMouseoverClickImage;
+    protected $_sMouseoverSrc;
 
     public function __construct()
     {
@@ -84,7 +84,8 @@ class cHTMLAlphaImage extends cHTMLImage {
 }
 
 class cHTMLErrorMessageList extends cHTMLDiv {
-    
+    protected cHTMLTable $_oTable;
+
     /**
      *  cHTMLErrorMessageList list all errors using a table
      */
@@ -107,7 +108,13 @@ class cHTMLErrorMessageList extends cHTMLDiv {
 }
 
 class cHTMLFoldableErrorMessage extends cHTMLTableRow {
-    
+    protected cHTMLTableData $_oFolding;
+    public cHTMLTableData $_oContent;
+    protected cHTMLTableData $_oIcon;
+    protected cHTMLAlphaImage $_oIconImg;
+    protected cHTMLDiv $_oTitle;
+    protected cHTMLDiv $_oMessage;
+
     /**
      *
      * @param string $sTitle
@@ -173,7 +180,9 @@ class cHTMLFoldableErrorMessage extends cHTMLTableRow {
 }
 
 class cHTMLInfoMessage extends cHTMLTableRow {
-    
+    protected cHTMLTableData $_oTitle;
+    protected cHTMLTableData $_oMessage;
+
     /**
      *
      * @param string $sTitle
diff --git a/setup/lib/class.setupmask.php b/setup/lib/class.setupmask.php
index 66f1bc8..eaa6175 100644
--- a/setup/lib/class.setupmask.php
+++ b/setup/lib/class.setupmask.php
@@ -46,6 +46,8 @@ class cSetupMask {
      * @var string
      */
     protected $_sHeader;
+    public mixed $_bBackstep;
+    public mixed $_bNextstep;
 
     /**
      * @param string $sStepTemplate
diff --git a/setup/lib/functions.filesystem.php b/setup/lib/functions.filesystem.php
index 89b38f4..15cee90 100644
--- a/setup/lib/functions.filesystem.php
+++ b/setup/lib/functions.filesystem.php
@@ -143,7 +143,7 @@ function canWriteFile($sFilename) {
         /* Ignore errors in case isWriteable() returns
          * a wrong information
          */
-        $fp = fopen($sFilename, "w");
+        $fp = @fopen($sFilename, "w");
         if (is_resource($fp)) {
             fclose($fp);
         }
diff --git a/setup/steps/forms/systemtest.php b/setup/steps/forms/systemtest.php
index c28a077..92d00b3 100644
--- a/setup/steps/forms/systemtest.php
+++ b/setup/steps/forms/systemtest.php
@@ -24,6 +24,8 @@ define("C_SEVERITY_ERROR", 4);
 
 class cSetupSystemtest extends cSetupMask {
 
+    public array $_aMessages;
+
     public function __construct($step, $previous, $next) {
         parent::__construct("templates/setup/forms/systemtest.tpl", $step);
         $bErrors = false;