R C Beams

I am a novice user of abaqus and trying to model crack growth in rc beams with longitudinal reinforcement and stirrups under dynamic loads by try and error method

rebar layers are in shell element and i am using CDP for my concrete. i am trying to find out if i need to have many solid parts or one is enough and if mesh adaptivity is necessary or not because of crack growth . I appreciate any consulting in this field and i will share my knowledge with anybody that helps me

my first error message is

3479 nodes on an embedded element do not lie in any host element. Check coordinates, exterior tolerance and absolute exterior tolerance parameters, and the host element set definition. The nodes have been identified in node set ErrNodeEmbeddedNode.

maybe i missunderstand the definition of embedded region and need to revise in it.