There are unconstrained degrees of freedom (DOF) in the model. To properly constrain the features of a part, establish a predominant datum reference frame (DRF) that can constrain all degrees of freedom (DOF) of the part. Parts generally require a predominant datum reference frame that constrains all 6 DOF. An exception is when a part is symmetrical, such as a simple sphere or a simple cylinder. In these cases, there may be degrees of freedom left unconstrained in the predominant DRF because they are not required to define the part
The predominant reference frame should be applied to the part features that orient or locate the part in an assembly. Those features should also be the first features in your model.