Trouble run custom connected system

Hi,

When I tried to create a custom connected system template I’m getting error

The System Has Encountered an Error
HTTP Code: 500
APNX-1-4198-000

Error Evaluating UI Expression
Expression evaluation error [evaluation ID = LTZZ4L1B] : Error creating bean with name 'plugin.package.Template]': Failed to introspect bean class [package.Template] for lookup method metadata: could not find class that it depends on; nested exception is java.lang.NoClassDefFoundError: com/appian/connectedsystems/templateframework/sdk/configuration/FolderPropertyDescriptor$FolderPropertyDescriptorBuilder

Appian version 19.1  On premises
Sdk from
https://github.com/appian/integration-sdk-examples/blob/master/Connected%20System%20Plug-in%20(CSP)%20Examples/Hello%20World/build.gradle

build jar, how to guide
docs.appian.com/.../develop-first-connected-system.html

Can Anyone help me on this?

Thanks in advance.