swagger2markup-maven-project-template Template Build Failure

Hello,

I recently want to use the plugin in my spring boot project, however, it fails to run since an ERROR of

[ERROR] Failed to execute goal io.github.swagger2markup:swagger2markup-maven-plugin:
1.1.0:convertSwagger2markup (default-cli) on project mapping-tool: 
Execution default-cli of goal io.github.swagger2markup:swagger2markup-maven-plugin:1.1.0:
convertSwagger2markup failed: Plugin io.github.swagger2markup:swagger2markup-maven-plugin:
1.1.0 or one of its dependencies could not be resolved: 
Failed to collect dependencies at io.github.swagger2markup:swagger2markup-maven-plugin:jar:1.1.0 -> io.github.swagger2markup:swagger2markup:jar:1.1.0 -> io.github.swagger2markup:markup-document-builder: jar:1.0.0 -> nl.jworks.markdown_to_asciidoc:markdown_to_asciidoc:jar:1.0: 
Failed to read artifact descriptor for nl.jworks.markdown_to_asciidoc:markdown_to_asciidoc:jar:1.0: Could not transfer artifact nl.jworks.markdown_to_asciidoc:markdown_to_asciidoc:pom:1.0 from/to jcenter-snapshots (http://oss.jfrog.org/artifactory/oss-snapshot-local/): Failed to transfer file http://oss.jfrog.org/artifactory/oss-snapshot-local/nl/jworks/markdown_to_asciidoc/markdown_to_asciidoc/1.0/markdown_to_asciidoc-1.0.pom with status code 409 -> [Help 1]
[ERROR]

Hence, I come to test the template. I try to clone it from this repo and run mvn clean package. It occurs the same error.

[ERROR] Failed to execute goal io.github.swagger2markup:swagger2markup-maven-plugin:1.3.3:convertSwagger2markup (default) on project swagger2markup-maven-project-template: Execution default of goal io.github.swagger2markup:swagger2markup-maven-plugin:1.3.3:convertSwagger2markup failed: Plugin io.github.swagger2markup:swagger2markup-maven-plugin:1.3.3 or one of its dependencies could not be resolved: Failed to collect dependencies at io.github.swagger2markup:swagger2markup-maven-plugin:jar:1.3.3 -> io.github.swagger2markup:swagger2markup-import-files-ext:jar:1.3.1 -> io.github.swagger2markup:swagger2markup:jar:1.3.1 -> io.github.swagger2markup:markup-document-builder:jar:1.1.1 -> nl.jworks.markdown_to_asciidoc:markdown_to_asciidoc:jar:1.0: Failed to read artifact descriptor for nl.jworks.markdown_to_asciidoc:markdown_to_asciidoc:jar:1.0: Could not transfer artifact nl.jworks.markdown_to_asciidoc:markdown_to_asciidoc:pom:1.0 from/to jcenter-snapshots (http://oss.jfrog.org/artifactory/oss-snapshot-local/): Failed to transfer file http://oss.jfrog.org/artifactory/oss-snapshot-local/nl/jworks/markdown_to_asciidoc/markdown_to_asciidoc/1.0/markdown_to_asciidoc-1.0.pom with status code 409 -> [Help 1]

I also tried to add the dependency of different versions, they are always failing, but end up with different download error.

Thanks for helping in advance.