ava.lang.NoClassDefFoundError: com/google/pubsub/v1/DetachSubscriptionRequest

[Soumik Das]

java.lang.NoClassDefFoundError: com/google/pubsub/v1/DetachSubscriptionRequest at com.google.cloud.pubsub.v1.stub.GrpcPublisherStub.<clinit>(GrpcPublisherStub.java:163) at com.google.cloud.pubsub.v1.Publisher.<init>(Publisher.java:187) at com.google.cloud.pubsub.v1.Publisher.<init>(Publisher.java:88) at com.google.cloud.pubsub.v1.Publisher$Builder.build(Publisher.java:798)

Why this error happens? How to fix it?