com.google.java.contract.PostconditionError: type != null

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com.google.java.contract.PostconditionError: type != null
at com.google.java.contract.core.apt.TypeFactory$TypeBuilder.com$google$java$contract$QH$com$google$java$contract$core$apt$TypeFactory$TypeBuilder$visitType(TypeFactory.java)
at com.google.java.contract.core.apt.TypeFactory$TypeBuilder.visitType(TypeFactory.java:443)
at com.google.java.contract.core.apt.TypeFactory.createType(TypeFactory.java:770)
at com.google.java.contract.core.apt.AnnotationProcessor.createTypes(AnnotationProcessor.java:502)

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