Syntax error in json library about trealla HOT 2 CLOSED

diff --git a/library/json.pl b/library/json.pl
index dac2788..4cae1ad 100644
--- a/library/json.pl
+++ b/library/json.pl
@@ -140,7 +140,7 @@ escape_char('\t', 't').

 json_character(EscapeChar) -->
         { escape_char(EscapeChar, PrintChar) },
-        "\\",
+        ['\\'],
         [PrintChar].
 json_character(PrintChar)  -->
     [PrintChar],
@@ -149,7 +149,7 @@ json_character(PrintChar)  -->
       char_code(PrintChar, PrintCharCode),
       PrintCharCode >= 32 }.
 json_character(EscapeChar) -->
-        "\\u",
+        ['\\', u],
         json_hex(H1),
         json_hex(H2),
         json_hex(H3),