diff --git a/mod/wiki/create.php b/mod/wiki/create.php
index cbd4a1cddec..b53ca36c81f 100644
--- a/mod/wiki/create.php
+++ b/mod/wiki/create.php
@@ -46,20 +46,20 @@ if (!empty($swid)) {
     $subwiki = wiki_get_subwiki($swid);
 
     if (!$wiki = wiki_get_wiki($subwiki->wikiid)) {
-        print_error('invalidwikiid', 'wiki');
+        print_error('incorrectwikiid', 'wiki');
     }
 
 } else {
     $subwiki = wiki_get_subwiki_by_group($wid, $group, $uid);
 
     if (!$wiki = wiki_get_wiki($wid)) {
-        print_error('invalidwikiid', 'wiki');
+        print_error('incorrectwikiid', 'wiki');
     }
 
 }
 
 if (!$cm = get_coursemodule_from_instance('wiki', $wiki->id)) {
-    print_error('invalidcoursemoduleid', 'wiki');
+    print_error('invalidcoursemodule');
 }
 
 $groups = new stdClass();
diff --git a/mod/wiki/diff.php b/mod/wiki/diff.php
index 4b99ff55a39..79f74e31c8b 100644
--- a/mod/wiki/diff.php
+++ b/mod/wiki/diff.php
@@ -63,7 +63,7 @@ if (!$cm = get_coursemodule_from_instance('wiki', $wiki->id)) {
 $course = $DB->get_record('course', array('id' => $cm->course), '*', MUST_EXIST);
 
 if ($compare >= $comparewith) {
-    print_error("A page version can only be compared with an older version.");
+    print_error('cannotcomparenewerversion', 'wiki');
 }
 
 require_login($course, true, $cm);
diff --git a/mod/wiki/lang/en/wiki.php b/mod/wiki/lang/en/wiki.php
index ea2ebccf303..9cc6e973a93 100644
--- a/mod/wiki/lang/en/wiki.php
+++ b/mod/wiki/lang/en/wiki.php
@@ -22,6 +22,7 @@ $string['backoldversion'] = 'Back to old version';
 $string['backpage'] = 'Back to page';
 $string['backtomapmenu'] = 'Back to map menu';
 $string['changerate'] = 'Do you wish to change it?';
+$string['cannotcomparenewerversion'] = 'A page version can only be compared with an older version.';
 $string['cannoteditpage'] = 'You can not edit this page.';
 $string['cannotmanagefiles'] = 'You don\'t have permission to manage the wiki files.';
 $string['cannotviewfiles'] = 'You don\'t have permission to view the wiki files.';
@@ -102,6 +103,9 @@ $string['history'] = 'History';
 $string['history_help'] = 'The history lists links to previous versions of the page.';
 $string['html'] = 'HTML';
 $string['incorrectdeleteversions'] = "Page versions provided for deletion are incorrect.";
+$string['incorrectpageid'] = 'Page ID is incorrect.';
+$string['incorrectsubwikiid'] = 'Subwiki ID is incorrect.';
+$string['incorrectwikiid'] = 'Wiki ID is incorrect.';
 $string['insertcomment'] = 'Insert comment';
 $string['insertimage'] = 'Insert an image...';
 $string['insertimage_help'] = 'This drop-down list will insert an image to the wiki editor. If you need to add more images to the wiki, please use "Files" tab.';
diff --git a/mod/wiki/view.php b/mod/wiki/view.php
index 8d5f5128e9a..e32d9e73723 100644
--- a/mod/wiki/view.php
+++ b/mod/wiki/view.php
@@ -268,7 +268,7 @@ if ($id) {
     //     * Error. No more options
     //     */
 } else {
-    print_error('incorrectparameters');
+    print_error('invalidparameters', 'wiki');
 }
 
 if (!wiki_user_can_view($subwiki, $wiki)) {