run asciidoctor task, then throw an error. But the document is converted.

My project: https://github.com/diguage/spring-framework/tree/analysis

I use PlantUML in the AsciiDoc document. When I ran the task, it threw an error:

╭─☞ ~/spring-framework git:(analysis) 
╰─➜ ./gradlew :truman:clean && ./gradlew :truman:asciidoctor

Deprecated Gradle features were used in this build, making it incompatible with Gradle 7.0.
Use '--warning-mode all' to show the individual deprecation warnings.
See https://docs.gradle.org/6.8.3/userguide/command_line_interface.html#sec:command_line_warnings

BUILD SUCCESSFUL in 1s
1 actionable task: 1 executed

A build scan was not published as you have not authenticated with server 'ge.spring.io'.

> Task :truman:asciidoctor
Exception in thread "main" org.asciidoctor.gradle.remote.AsciidoctorRemoteExecutionException: ERROR: The following messages from AsciidoctorJ are treated as errors:
Finding 'dot' in attributes
- Found value '/usr/local/bin/dot' in attribute 'graphvizdot'
- Is '/usr/local/bin/dot' executable? true
        at org.asciidoctor.gradle.remote.ExecutorBase.failOnWarnings(ExecutorBase.groovy:229)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:101)
        at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:323)
        at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1217)
        at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1041)
        at org.codehaus.groovy.runtime.InvokerHelper.invokePogoMethod(InvokerHelper.java:1011)
        at org.codehaus.groovy.runtime.InvokerHelper.invokeMethod(InvokerHelper.java:994)
        at org.codehaus.groovy.runtime.InvokerHelper.invokeMethodSafe(InvokerHelper.java:97)
        at org.asciidoctor.gradle.remote.AsciidoctorJavaExec$_run_closure3.doCall(AsciidoctorJavaExec.groovy:76)
        at org.asciidoctor.gradle.remote.AsciidoctorJavaExec$_run_closure3.call(AsciidoctorJavaExec.groovy)
        at org.codehaus.groovy.runtime.DefaultGroovyMethods.each(DefaultGroovyMethods.java:2330)
        at org.codehaus.groovy.runtime.DefaultGroovyMethods.each(DefaultGroovyMethods.java:2315)
        at org.codehaus.groovy.runtime.DefaultGroovyMethods.each(DefaultGroovyMethods.java:2356)
        at org.asciidoctor.gradle.remote.AsciidoctorJavaExec.run(AsciidoctorJavaExec.groovy:68)
        at org.asciidoctor.gradle.remote.AsciidoctorJavaExec.main(AsciidoctorJavaExec.groovy:49)

> Task :truman:asciidoctor FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':truman:asciidoctor'.
> Remote Asciidoctor process failed to complete successfully

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

Deprecated Gradle features were used in this build, making it incompatible with Gradle 7.0.
Use '--warning-mode all' to show the individual deprecation warnings.
See https://docs.gradle.org/6.8.3/userguide/command_line_interface.html#sec:command_line_warnings

BUILD FAILED in 39s
1 actionable task: 1 executed

A build scan was not published as you have not authenticated with server 'ge.spring.io'.

But the dot is OK:

$ /usr/local/bin/dot -v
dot - graphviz version 3.0.0 (20220226.1711)
libdir = "/usr/local/Cellar/graphviz/3.0.0/lib/graphviz"
Activated plugin library: libgvplugin_dot_layout.6.dylib
Using layout: dot:dot_layout
Activated plugin library: libgvplugin_core.6.dylib
Using render: dot:core
Using device: dot:dot:core
The plugin configuration file:
	/usr/local/Cellar/graphviz/3.0.0/lib/graphviz/config6
		was successfully loaded.
    render	:  cairo dot dot_json fig gd json json0 map mp pic pov ps quartz svg tk visio vml vrml xdot xdot_json
    layout	:  circo dot fdp neato nop nop1 nop2 osage patchwork sfdp twopi
    textlayout	:  textlayout
    device	:  bmp canon cgimage cmap cmapx cmapx_np dot dot_json eps exr fig gd gd2 gif gv icns ico imap imap_np ismap jp2 jpe jpeg jpg json json0 mp pct pdf pic pict plain plain-ext png pov ps ps2 psd sgi svg svgz tga tif tiff tk vdx vml vmlz vrml wbmp webp xdot xdot1.2 xdot1.4 xdot_json
    loadimage	:  (lib) bmp eps gd gd2 gif jpe jpeg jpg pdf png ps svg webp xbm

But the document was converted successfully. The document was at the folder: spring-framework/truman/build/docs/asciidoc.