Problem with Dynamic attach

(Sorry about the stupid title...)
I just used it today. thanks.
Trying to monitor my java processes, got many messages similar to:
Dynamic attach successful
Attaching to VM [1]
▒java.util.ServiceConfigurationError: com.sun.tools.attach.spi.AttachProvider: Provider sun.tools.attach.LinuxAttachProvider not found
v at java.base/java.util.ServiceLoader.fail(ServiceLoader.java:588)
at java.base/java.util.ServiceLoader$LazyClassPathLookupIterator.nextProviderClass(ServiceLoader.java:1211)
at java.base/java.util.ServiceLoader$LazyClassPathLookupIterator.hasNextService(ServiceLoader.java:1220)
at java.base/java.util.ServiceLoader$LazyClassPathLookupIterator.hasNext(ServiceLoader.java:1264)
at java.base/java.util.ServiceLoader$2.hasNext(ServiceLoader.java:1299)
at java.base/java.util.ServiceLoader$3.hasNext(ServiceLoader.java:1384)
at jdk.attach/com.sun.tools.attach.spi.AttachProvider.providers(AttachProvider.java:258)
at jdk.attach/com.sun.tools.attach.VirtualMachine.attach(VirtualMachine.java:200)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at com.singularity.ee.agent.appagent.AgentEntryPoint.main(AgentEntryPoint.java:1127)
0agent path >>>/opt/AppServerAgent/javaagent.jar