how i resolve this problem : A9K-MOD400-SE slot 7 is inactive
RP/0/RSP0/CPU0:PE-A9K-Ouardia#show platform
Tue Oct 4 12:53:40.637 UTC
Node Type State Config state
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0/RSP0/CPU0 A9K-RSP5-SE(Active) IOS XR RUN NSHUT
0/RSP1/CPU0 A9K-RSP5-SE(Standby) IOS XR RUN NSHUT
0/FT0 ASR-9910-FAN OPERATIONAL NSHUT
0/FT1 ASR-9910-FAN OPERATIONAL NSHUT
0/0/CPU0 A9K-MOD400-SE IOS XR RUN NSHUT
0/0/0 A9K-MPA-2X100GE OK
0/7 A9K-MOD400-SE SW_INACTIVE NSHUT
0/PT0 A9K-DC-PEM-V3 OPERATIONAL NSHUT
0/PT1 A9K-DC-PEM-V3 OPERATIONAL NSHUT
