[mysql] Not unique table/alias

I get the error ERROR 1066 (42000): Not unique table/alias:

I cant figure out whats wrong with it.

SELECT Project_Assigned.ProjectID, Project_Title, Account.Account_ID, Username, Access_Type
FROM Project_Assigned 
JOIN Account 
  ON Project_Assigned.AccountID = Account.Account_ID
JOIN Project
  ON Project_Assigned.ProjectID = Project.Project_ID
where Access_Type = 'Client';

 select persons.personsid,name,info.id,address
    -> from persons
    -> inner join persons on info.infoid = info.info.id;