There is at least one abstract method in this class. Maybe declare it as abstract, or implement the remaining methods: getNodeDefinition, load, prepend
The method addSubSource() does not seem to exist on object<OAuth2Framework\B...ndpoint\EndpointSource>.
This check looks for calls to methods that do not seem to exist on a given type.
It looks for the method on the type itself as well as in inherited classes or
implemented interfaces.
This is most likely a typographical error or the method has been renamed.
The method addSubSource() does not seem to exist on object<OAuth2Framework\B...ndpoint\EndpointSource>.
This check looks for calls to methods that do not seem to exist on a given type.
It looks for the method on the type itself as well as in inherited classes or
implemented interfaces.
This is most likely a typographical error or the method has been renamed.
The method addSubSource() does not seem to exist on object<OAuth2Framework\B...ndpoint\EndpointSource>.
This check looks for calls to methods that do not seem to exist on a given type.
It looks for the method on the type itself as well as in inherited classes or
implemented interfaces.
This is most likely a typographical error or the method has been renamed.
The method addSubSource() does not seem to exist on object<OAuth2Framework\B...ndpoint\EndpointSource>.
This check looks for calls to methods that do not seem to exist on a given type.
It looks for the method on the type itself as well as in inherited classes or
implemented interfaces.
This is most likely a typographical error or the method has been renamed.
The method addSubSource() does not seem to exist on object<OAuth2Framework\B...ndpoint\EndpointSource>.
This check looks for calls to methods that do not seem to exist on a given type.
It looks for the method on the type itself as well as in inherited classes or
implemented interfaces.
This is most likely a typographical error or the method has been renamed.
The method addSubSource() does not seem to exist on object<OAuth2Framework\B...ndpoint\EndpointSource>.
This check looks for calls to methods that do not seem to exist on a given type.
It looks for the method on the type itself as well as in inherited classes or
implemented interfaces.
This is most likely a typographical error or the method has been renamed.
The method addSubSource() does not seem to exist on object<OAuth2Framework\B...ndpoint\EndpointSource>.
This check looks for calls to methods that do not seem to exist on a given type.
It looks for the method on the type itself as well as in inherited classes or
implemented interfaces.
This is most likely a typographical error or the method has been renamed.
The method addSubSource() does not seem to exist on object<OAuth2Framework\B...ndpoint\EndpointSource>.
This check looks for calls to methods that do not seem to exist on a given type.
It looks for the method on the type itself as well as in inherited classes or
implemented interfaces.
This is most likely a typographical error or the method has been renamed.
The method addSubSource() does not seem to exist on object<OAuth2Framework\B...ndpoint\EndpointSource>.
This check looks for calls to methods that do not seem to exist on a given type.
It looks for the method on the type itself as well as in inherited classes or
implemented interfaces.
This is most likely a typographical error or the method has been renamed.
The method addSubSource() does not seem to exist on object<OAuth2Framework\B...ndpoint\EndpointSource>.
This check looks for calls to methods that do not seem to exist on a given type.
It looks for the method on the type itself as well as in inherited classes or
implemented interfaces.
This is most likely a typographical error or the method has been renamed.