Can't create new version

When I try to create 1.1 (which is a new version), I get the following message: Additionally, if I try to create another version, let's say 1.1.1 or 2.0, I just get same error.

When inspecting the call, this is the result:

{
  "errors" : [ {
    "id" : "48d65ae9-b7d5-44cb-85a6-b7295202f13b",
    "status" : "409",
    "code" : "ENTITY_ERROR.RELATIONSHIP.INVALID",
    "title" : "The provided entity includes a relationship with an invalid value",
    "detail" : "You cannot create a new version of the App in the current state.",
    "source" : {
      "pointer" : "/data/relationships/app"
    }
  } ]