diff --git a/exceptions/generic/MDaccessDeniedException.php b/exceptions/generic/MDaccessDeniedException.php
new file mode 100644
index 0000000..6f70162
--- /dev/null
+++ b/exceptions/generic/MDaccessDeniedException.php
@@ -0,0 +1,22 @@
+<?PHP
+declare(strict_types = 1);
+
+/**
+ * Exception thrown in case the main entity of a page (e.g. an object, an institution etc.)
+ * are not set public.
+ */
+class MDaccessDeniedException extends Exception {
+
+    /**
+     * Error message.
+     *
+     * @return string
+     */
+    public function errorMessage() {
+        //error message
+        $errorMsg = 'You have no permission to access this.';
+        return $errorMsg;
+
+    }
+
+}
diff --git a/exceptions/generic/MDgenericInvalidInputsException.php b/exceptions/generic/MDgenericInvalidInputsException.php
new file mode 100644
index 0000000..87e4783
--- /dev/null
+++ b/exceptions/generic/MDgenericInvalidInputsException.php
@@ -0,0 +1,22 @@
+<?PHP
+declare(strict_types = 1);
+
+/**
+ * Exception thrown in case the main entity of a page (e.g. an object, an institution etc.)
+ * are not set public.
+ */
+class MDgenericInvalidInputsException extends Exception {
+
+    /**
+     * Error message.
+     *
+     * @return string
+     */
+    public function errorMessage() {
+        //error message
+        $errorMsg = 'Inputs are not valid.';
+        return $errorMsg;
+
+    }
+
+}
diff --git a/exceptions/generic/MDhttpFailedException.php b/exceptions/generic/MDhttpFailedException.php
new file mode 100644
index 0000000..32e1be6
--- /dev/null
+++ b/exceptions/generic/MDhttpFailedException.php
@@ -0,0 +1,22 @@
+<?PHP
+declare(strict_types = 1);
+
+/**
+ * Exception thrown in case the main entity of a page (e.g. an object, an institution etc.)
+ * are not set public.
+ */
+class MDhttpFailedException extends Exception {
+
+    /**
+     * Error message.
+     *
+     * @return string
+     */
+    public function errorMessage() {
+        //error message
+        $errorMsg = 'Inputs are not valid.';
+        return $errorMsg;
+
+    }
+
+}
diff --git a/exceptions/updates/MDNoUpdateVarSetException.php b/exceptions/updates/MDNoUpdateVarSetException.php
new file mode 100644
index 0000000..6a73260
--- /dev/null
+++ b/exceptions/updates/MDNoUpdateVarSetException.php
@@ -0,0 +1,22 @@
+<?PHP
+declare(strict_types = 1);
+
+/**
+ * Custom exception class for invalid page parameters, which must be values of a
+ * preset list of allowed values.
+ */
+class MDNoUpdateVarSetException extends Exception {
+
+    /**
+     * Error message.
+     *
+     * @return string
+     */
+    public function errorMessage() {
+        //error message
+        $errorMsg = 'No update variable has been set.';
+        return $errorMsg;
+
+    }
+
+}
diff --git a/exceptions/updates/MDTooManyFilesUploadException.php b/exceptions/updates/MDTooManyFilesUploadException.php
new file mode 100644
index 0000000..75c9db1
--- /dev/null
+++ b/exceptions/updates/MDTooManyFilesUploadException.php
@@ -0,0 +1,28 @@
+<?PHP
+/**
+ * This file contains an exception class for wrongly used files.
+ *
+ * @file
+ *
+ * @author Joshua Ramon Enslin <joshua@museum-digital.de>
+ */
+declare(strict_types = 1);
+
+/**
+ * Custom exception class for wrongly used files.
+ */
+class MDTooManyFilesUploadException extends Exception {
+
+    /**
+     * Error message.
+     *
+     * @return string
+     */
+    public function errorMessage() {
+        //error message
+        $errorMsg = 'This file\'s extension or mimetype is incorrect: ' . $this->getMessage();
+        return $errorMsg;
+
+    }
+
+}
diff --git a/exceptions/updates/MDWrongFileType.php b/exceptions/updates/MDWrongFileType.php
new file mode 100644
index 0000000..38a4049
--- /dev/null
+++ b/exceptions/updates/MDWrongFileType.php
@@ -0,0 +1,28 @@
+<?PHP
+/**
+ * This file contains an exception class for wrongly used files.
+ *
+ * @file
+ *
+ * @author Joshua Ramon Enslin <joshua@museum-digital.de>
+ */
+declare(strict_types = 1);
+
+/**
+ * Custom exception class for wrongly used files.
+ */
+class MDWrongFileType extends Exception {
+
+    /**
+     * Error message.
+     *
+     * @return string
+     */
+    public function errorMessage() {
+        //error message
+        $errorMsg = 'This file\'s extension or mimetype is incorrect: ' . $this->getMessage();
+        return $errorMsg;
+
+    }
+
+}
diff --git a/exceptions/updates/MDcouldNotSaveException.php b/exceptions/updates/MDcouldNotSaveException.php
new file mode 100644
index 0000000..9c086fc
--- /dev/null
+++ b/exceptions/updates/MDcouldNotSaveException.php
@@ -0,0 +1,22 @@
+<?PHP
+declare(strict_types = 1);
+
+/**
+ * Exception thrown in case the main entity of a page (e.g. an object, an institution etc.)
+ * are not set public.
+ */
+class MDcouldNotSaveException extends Exception {
+
+    /**
+     * Error message.
+     *
+     * @return string
+     */
+    public function errorMessage() {
+        //error message
+        $errorMsg = 'Could not save.';
+        return $errorMsg;
+
+    }
+
+}
diff --git a/exceptions/updates/MDcouldNotSetPublic.php b/exceptions/updates/MDcouldNotSetPublic.php
new file mode 100644
index 0000000..468a64b
--- /dev/null
+++ b/exceptions/updates/MDcouldNotSetPublic.php
@@ -0,0 +1,23 @@
+<?PHP
+declare(strict_types = 1);
+
+/**
+ * Exception thrown in case the main entity of a page (e.g. an object, an institution etc.)
+ * are not set public.
+ */
+class MDcouldNotSetPublic extends Exception {
+
+    /**
+     * Error message.
+     *
+     * @return string
+     */
+    public function errorMessage() {
+        //error message
+        $errorMsg = 'Could not set this to public.';
+        return $errorMsg;
+
+    }
+
+}
+