我正在将freemaker集成到我的intellij应用程序中。然而，每次我运行程序时，我都会遇到这个错误。

[ERROR] Failed to execute goal on project demo: Could not resolve dependencies for project com.example:demo:jar:0.0.1-SNAPSHOT: Failed to collect dependencies at org.springframework.bo
ot:spring-boot-starter-freemarker:jar:2.5.4: Failed to read artifact descriptor for org.springframework.boot:spring-boot-starter-freemarker:jar:2.5.4: Could not transfer artifact org.s
pringframework.boot:spring-boot-starter-freemarker:pom:2.5.4 from/to central (https://repo.maven.apache.org/maven2): transfer failed for https://repo.maven.apache.org/maven2/org/springframework/boot/spring-boot-starter-freemarker/2.5.4/spring-boot-starter-freemarker-2.5.4.pom: Network is unreachable: connect -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/DependencyResolutionException

错误总是在

<artifactId>spring-boot-starter-freemarker</artifactId>

我尝试了很多修复方法，比如无效并重新启动cachce，重新启动itellij和计算机等等。我甚至尝试了帮助这个用户Missing artifact org.springframework.boot:spring-boot-starter-parent:jar:1.3.2.RELEASE的修复程序，但它对我不起作用。
这是我的pom。xml文件

<?xml version="1.0" encoding="UTF-8"?>
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.5.4</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>11</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-freemarker</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

如何解决此错误？