conflicts with existing wildcard

[fcddk]

my code:
//get task by id,return task
r.GET("cms/agent/v1/tasks/:id", handlers.GetTaskById)
//get task by object_id, return task
r.GET("cms/agent/v1/tasks/next/:objectId", handlers.GetNextTaskByObject)

error:
.panic: 'next' in new path '/cms/agent/v1/tasks/next/:objectId' conflicts with existing wildcard ':id' in existing prefix '/cms/agent/v1/tasks/:id'