because the slot appear with question mark? as I correct this situation?

Device "Autochanger" has 24 slots.
Connecting to Storage daemon MSL2024 at 192.90.90.97:9103 ...
3306 Issuing autochanger "list" command.
 Slot |   Volume Name    |   Status  |     Media Type       |      Pool         
 |
------+------------------+-----------+----------------------+--------------------|
    1 |         VXS002L6 |      Full |                LTO-6 |           
FullPool |
    2*|         VXS003L6 |    Append |                LTO-6 |            
DifPool |
    3*|         VXS004L6 |         ? |                    ? |                  
? |
    4*|         VXS005L6 |         ? |                    ? |                  
? |
    5*|         VXS006L6 |         ? |                    ? |                  
? |
    6*|         VXS007L6 |         ? |                    ? |                  
? |
    7*|         VXS008L6 |      Used |                LTO-6 |           
FullPool |
    8 |         VXS009L6 |      Used |                LTO-6 |           
FullPool |
    9*|         VXS010L6 |         ? |                    ? |                  
? |
   10*|         VXS011L6 |    Purged |                LTO-6 |            
IncPool |
   11 |         VXS012L6 |    Purged |                LTO-6 |           
FullPool |
   12*|         VXS013L6 |         ? |                    ? |                  
? |
   13*|         VXS014L6 |         ? |                    ? |                  
? |
   14 |         VXS015L6 |      Full |                LTO-6 |            
DifPool |
   15*|         VXS016L6 |         ? |                    ? |                  
? |
   16*|         VXS017L6 |         ? |                    ? |                  
? |
   17*|         VXS018L6 |         ? |                    ? |                  
? |
   18 |         VXS019L6 |    Append |                LTO-6 |        
AixFullPool |
   19*|         VXS020L6 |         ? |                    ? |                  
? |
   20*|         VXS021L6 |         ? |                    ? |                  
? |
   21*|         VXS022L6 |         ? |                    ? |                  
? |
   22 |         VXS023L6 |    Purged |                LTO-6 |           
FullPool |
   23*|                  |         ? |                    ? |                  
? |
   24 |                  |           |                      |                   
 |

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