N2048P Port Error

Hi Team Dell Technical Support,

Please help me troubleshoot, somethink problem in the log.

<188> Dec 6 07:51:23 PEPBPNACSW_A02-1 POE[PoE Req]: hpc_poe_pwrdsne.c(4474) 131200 %% WARN Please configure Power Managementmode to Class Based for 802.3at devices
<188> Dec 6 07:51:23 PEPBPNACSW_A02-1 POE[PoE Req]: hpc_poe_pwrdsne.c(4474) 131199 %% WARN Please configure Power Managementmode to Class Based for 802.3at devices
<188> Dec 6 07:50:59 PEPBPNACSW_A02-1 POE[PoE Req]: hpc_poe_pwrdsne.c(4474) 131198 %% WARN Please configure Power Managementmode to Class Based for 802.3at devices
<188> Dec 6 07:50:58 PEPBPNACSW_A02-1 POE[PoE Req]: hpc_poe_pwrdsne.c(4474) 131197 %% WARN Please configure Power Managementmode to Class Based for 802.3at devices
This port connected to ip phone device, ip phone is not running normaly

Access_Switch_A02#show running-config interface gi1/0/48
spanning-tree portfast
switchport access vlan 98 ==> Vlan Management
switchport voice vlan 100 ==> Vlan Voice

Machine Description............... Dell EMC Networking Switch
System Model ID................... N2048P
Machine Type...................... Dell EMC Networking N2048P
Serial Number..................... CN0WYWXP2829878V0244A01
Manufacturer...................... 0xbc00
Burned In MAC Address............. E4F0.0433.4FCA
System Object ID.................. 1.3.6.1.4.1.674.10895.3056
SOC Version....................... BCM56340_A0
HW Version........................ 5
CPLD Version...................... 20
Image File........................ N2000Stdv6.5.2.15
Software Capability............... Stack Limit = 12, VLAN Limit = 4093

unit active      backup      current-active next-active
---- ----------- ----------- -------------- --------------
1    6.5.2.15    6.5.1.6     6.5.2.15       6.5.2.15

Thanks