New rules can not be found

Development
1

I created myGrammar.xml to add new rules as I want. I added these rules with patternRuleLoader() method. when I printed the ID of a rule, there is no problem. But when I want to try these rules, There is no suggested words and it will give an error like java.lang.IndexOutOfBoundsException: Index: 0, Size: 0 to “replaceSentence = sentence.replace(wrongStr, match.getSuggestedReplacements().get(0));”.

Here is myGrammar.xml:

<?xml version="1.0" encoding="UTF-8"?> <?xml-stylesheet type="text/xsl" href="../../../../../../../../../languagetool-core/src/main/resources/org/languagetool/rules/print.xsl" ?> <?xml-stylesheet type="text/css" href="../../../../../../../../../languagetool-core/src/main/resources/org/languagetool/rules/rules.css" title="Easy editing stylesheet" ?> 
    <rules lang="en" >


    <!-- ====================================================================== -->
    <!-- Possible typo -->
    <!-- ====================================================================== -->
    <category id="TYPOS" name="Possible Typo" type="misspelling">
    <!-- English rule, 2020-11-03 -->
        <rule id="FND" name="find">
            <pattern>
                <token>fnd</token>
            </pattern>
            <message>Do you mean "find"?</message>
            <example correction='find'>How can I <marker>fnd</marker> the application?</example>

        </rule>
        <!-- English rule, 2020-11-03 -->
        <rule id="FAND" name="find">
            <pattern>
                <token>fand</token>
            </pattern>
            <message>Do you mean "find"?</message>
            <example correction='find'>How can I <marker>fand</marker> the application?</example>

        </rule>
    </category>
    </rules>

and here is my main code that I am loading my rules:
PatternRuleLoader loader = new PatternRuleLoader();

                List<AbstractPatternRule> rules = loader.getRules(new File("home/my-grammar.xml"));

                //List<AbstractPatternRule> rules = JLanguageTool.loadPatternRules("home/my-grammar.xml");
                System.out.println(rules.get(0).getFullId());
                for (AbstractPatternRule rule : rules) {
                    langTool.addRule(rule);
                }

My sentence that I tried is “How can I fnd the application”.

Please help me. I did almost everything to add this rule such as importing Language Tool as locally or changing the grammar.xml from maven repository. However ı can not succeed.

Thanks for your help.