ANTLR v4的mysql语法文件中存在语法错误

我正在使用ANTLR v4 repo中的Lexer和解析器 here 用于在java中解析mysql。但我在MySqlLexer文件中遇到了一个错误。g4可用 here 在以下行集合中:

lexer grammar MySqlLexer;

channels { MYSQLCOMMENT, ERRORCHANNEL }

// SKIP

SPACE:                               [ \t\r\n]+    -> channel(HIDDEN);
SPEC_MYSQL_COMMENT:                  '/*!' .+? '*/' -> channel(MYSQLCOMMENT);
COMMENT_INPUT:                       '/*' .*? '*/' -> channel(HIDDEN);
LINE_COMMENT:                        (
                                   ('-- ' | '#') ~[\r\n]* ('\r'? '\n' | EOF) 
                                   | '--' ('\r'? '\n' | EOF) 
                                 ) -> channel(HIDDEN);  

第一个错误:

语法错误:“{MYSQLCOMMENT,ERRORCHANNEL}”是完整的 匹配规则前言时令我惊讶

第二个错误:(在“空格:”行中)

语法错误:“(”在匹配时让我大吃一惊 规则前言

语法错误:在匹配时,外部输入“)”应为SEMI 规则

这是我的pom。用于检查我使用的版本的xml:

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>autoGem</groupId>
  <artifactId>autoGem</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>autoGem</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <antlr4.visitor>true</antlr4.visitor>
    <antlr4.listener>true</antlr4.listener>
    <target.jvm>1.6</target.jvm>
    <antlr.version>4.7.1</antlr.version>
    <antlr4test-maven-plugin.version>1.10</antlr4test-maven-plugin.version>
  </properties>

  <dependencies>
  <dependency>
      <groupId>org.antlr</groupId>
      <artifactId>antlr4-runtime</artifactId>
      <version>${antlr.version}</version>
      <type>jar</type>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
  </dependencies>

  <build>
    <plugins>
    <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.0</version>
        <configuration>
          <source>${target.jvm}</source>
          <target>${target.jvm}</target>
          <showWarnings>true</showWarnings>
          <showDeprecation>true</showDeprecation>
          <compilerArguments>
            <Xlint />
          </compilerArguments>
        </configuration>
      </plugin>
      <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>build-helper-maven-plugin</artifactId>
        <version>1.7</version>
        <executions>
          <execution>
            <phase>generate-sources</phase>
            <goals>
              <goal>add-source</goal>
            </goals>
            <configuration>
              <sources>
                <source>target/generated-sources/antlr4</source>
              </sources>
            </configuration>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <groupId>org.antlr</groupId>
        <artifactId>antlr4-maven-plugin</artifactId>
        <version>4.3</version>
        <configuration>
            <includes>
                <include>MySqlLexer.g4</include>
                <include>MySqlParser.g4</include>
            </includes>
            <visitor>true</visitor>
            <listener>true</listener>
        </configuration>
        <executions>
          <execution>
            <id>antlr4</id>
            <goals>
              <goal>antlr4</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
    </plugins>
    <pluginManagement>
      <plugins>
        <!--This plugin's configuration is used to store Eclipse m2e settings 
          only. It has no influence on the Maven build itself. -->
        <plugin>
          <groupId>org.eclipse.m2e</groupId>
          <artifactId>lifecycle-mapping</artifactId>
          <version>1.0.0</version>
          <configuration>
            <lifecycleMappingMetadata>
              <pluginExecutions>
                <pluginExecution>
                  <pluginExecutionFilter>
                    <groupId>org.antlr</groupId>
                    <artifactId>antlr4-maven-plugin</artifactId>
                    <versionRange>[4.0,)</versionRange>
                    <goals>
                      <goal>antlr4</goal>
                    </goals>
                  </pluginExecutionFilter>
                  <action>
                    <execute>
                      <runOnIncremental>true</runOnIncremental>
                    </execute>
                  </action>
                </pluginExecution>
              </pluginExecutions>
            </lifecycleMappingMetadata>
          </configuration>
        </plugin>
      </plugins>
    </pluginManagement>
  </build>
</project>

我对ANTLR语法很陌生。请帮忙。
谢谢:)