diff --git a/core/src/main/resources/error/error-classes.json b/core/src/main/resources/error/error-classes.json
index 7f43cc2deda5..28e19bfdff4e 100644
--- a/core/src/main/resources/error/error-classes.json
+++ b/core/src/main/resources/error/error-classes.json
@@ -643,14 +643,14 @@
       "The pattern <pattern> is invalid."
     ],
     "subClass" : {
-      "ESC_IN_THE_MIDDLE" : {
+      "ESC_AT_THE_END" : {
         "message" : [
-          "the escape character is not allowed to precede <char>."
+          "the escape character is not allowed to end with."
         ]
       },
-      "ESC_AT_THE_END" : {
+      "ESC_IN_THE_MIDDLE" : {
         "message" : [
-          "the escape character is not allowed to end with."
+          "the escape character is not allowed to precede <char>."
         ]
       }
     }