Ansys staff can not download images on the student portal, so if you want to reach a larger audience to get answers from, please insert the images inline.
Also from your description, it seems like you are using bearings under connections.
For each incorrectly defined object in Mechanical, there will be "?" (question mark) in front of that object in the tree. Also, the details object will be highlighted in red for an incorrectly defined object (yellow for an underdefined object). You can click on the "Show Errors" button under Tools in the Home Ribbon tab to highlight the error in the message pane.
How to access Ansys Online Help Document
How to show full resolution image
Guidelines on the Student Community
How to use Google to search within Ansys Student Community