【Maven错误】 Non-resolvable parent POM for ...... Return code is: 500 , ReasonPhrase:Internal Server Error. and 'parent.relativePath' points at no local POM @ line 14, column 11

[INFO] Scanning for projects...
Downloading: http://www.myhost.com/maven/jdk18/org/springframework/boot/spring-boot-starter-parent/2.1.1.RELEASE/spring-boot-starter-parent-2.1.1.RELEASE.pom
Downloading: http://nexus.jiushiyaokuaile.cn/nexus/content/groups/public/org/springframework/boot/spring-boot-starter-parent/2.1.1.RELEASE/spring-boot-starter-parent-2.1.1.RELEASE.pom
[ERROR] [ERROR] Some problems were encountered while processing the POMs:
[FATAL] Non-resolvable parent POM for co.yiiu:pybbs:5.2.1: Could not transfer artifact org.springframework.boot:spring-boot-starter-parent:pom:2.1.1.RELEASE from/to jdk18 (http://www.myhost.com/maven/jdk18): Failed to transfer file: http://www.myhost.com/maven/jdk18/org/springframework/boot/spring-boot-starter-parent/2.1.1.RELEASE/spring-boot-starter-parent-2.1.1.RELEASE.pom. Return code is: 500 , ReasonPhrase:Internal Server Error. and ‘parent.relativePath‘ points at no local POM @ line 14, column 11
 @ 
[ERROR] The build could not read 1 project -> [Help 1]
[ERROR]   
[ERROR]   The project co.yiiu:pybbs:5.2.1 (/Users/zhangboqing/Software/MyGithub/pybbs/pom.xml) has 1 error
[ERROR]     Non-resolvable parent POM for co.yiiu:pybbs:5.2.1: Could not transfer artifact org.springframework.boot:spring-boot-starter-parent:pom:2.1.1.RELEASE from/to jdk18 (http://www.myhost.com/maven/jdk18): Failed to transfer file: http://www.myhost.com/maven/jdk18/org/springframework/boot/spring-boot-starter-parent/2.1.1.RELEASE/spring-boot-starter-parent-2.1.1.RELEASE.pom. Return code is: 500 , ReasonPhrase:Internal Server Error. and ‘parent.relativePath‘ points at no local POM @ line 14, column 11 -> [Help 2]
[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/ProjectBuildingException
[ERROR] [Help 2] http://cwiki.apache.org/confluence/display/MAVEN/UnresolvableModelException

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