Guys I finally found the soultion. As NC88CARP mentioned, the issue is coming when one of your players has a role (for example team's captain) and you transfer him to another team before changing the role. The quick solution is to go to team managment in the setting and import another team's sheet to your team's sheet. for example if you taking Arsenal and you already transferd Saka to another team, which is your penalty taker, import another team's sheet such as Man United. In this case, it remanage Arsenal with available players and the issue will disappear.
