Switch N4032F Spanning Tree Problem

Dear All, i have a coreswitch dell powerconnect N4032F, then have an error with spanning tree in all my network. most of them have an error like this below, can anyone suggest how to solve that. i don't have any dhcp configuration in my network, effect of the spanning tree is on all active ports and vlan

<190> Aug 21 09:56:52 CoreSwitch-1 CLI_WEB[emWeb]: cmd_logger_api.c(260) 8985 %% [CLI:admin:192.168.3.91] User admin logged in to enable mode.
<189> Aug 21 09:56:51 CoreSwitch-1 TRAPMGR[trapTask]: traputil.c(721) 8984 %% Session 0 of type 2 started for user admin connected from 192.168.3.91.
<190> Aug 21 09:56:51 CoreSwitch-1 CLI_WEB[emWeb]: cmd_logger_api.c(260) 8983 %% [CLI:admin:192.168.3.91] User has succesfully logged in
<189> Aug 21 09:55:22 CoreSwitch-1 TRAPMGR[trapTask]: traputil.c(721) 8982 %% Po32 is transitioned from the Learning state to the Forwarding state in instance 0
<189> Aug 21 09:55:22 CoreSwitch-1 TRAPMGR[trapTask]: traputil.c(721) 8981 %% Po32 is transitioned from the Forwarding state to the Blocking state in instance 0
<187> Aug 21 09:49:40 CoreSwitch-1 OpEN[tRpcsrv.01000]: openapi_logging.c(1294) 8980 %% SUPPORT-ASSIST: Unable to resolve hostname: 'stor.g3.ph.dell.com'.
<190> Aug 21 09:49:40 CoreSwitch-1 OpEN[tRpcsrv.01000]: openapi_logging.c(1294) 8979 %% SUPPORT-ASSIST: SupportAssist server 'default' connection lost.
<187> Aug 21 08:57:14 CoreSwitch-1 IPV6[dtlTask]: ip6map.c(4016) 8951 %% Received invalid ip6 packet on Vl20: TC 0, flow 916598, length 35438, next head 28, hop lim 37, src fe80::30:c574:4f48:18c6:7247, dst 6c21:75a8:38eb:23fd:5d7c:a818:ccef:2e3a.
<187> Aug 21 08:49:22 CoreSwitch-1 OpEN[tRpcsrv.01000]: openapi_logging.c(1294) 8950 %% SUPPORT-ASSIST: Unable to resolve hostname: 'stor.g3.ph.dell.com'.
<190> Aug 21 08:49:22 CoreSwitch-1 OpEN[tRpcsrv.01000]: openapi_logging.c(1294) 8949 %% SUPPORT-ASSIST: SupportAssist server 'default' connection lost.
<189> Aug 21 08:34:20 CoreSwitch-1 TRAPMGR[trapTask]: traputil.c(721) 8921 %% Po32 is transitioned from the Learning state to the Forwarding state in instance 0
<189> Aug 21 08:34:20 CoreSwitch-1 TRAPMGR[trapTask]: traputil.c(721) 8920 %% Po32 is transitioned from the Forwarding state to the Blocking state in instance 0
<187> Aug 21 07:49:04 CoreSwitch-1 OpEN[tRpcsrv.01000]: openapi_logging.c(1294) 8919 %% SUPPORT-ASSIST: Unable to resolve hostname: 'stor.g3.ph.dell.com'.
<190> Aug 21 07:49:04 CoreSwitch-1 OpEN[tRpcsrv.01000]: openapi_logging.c(1294) 8918 %% SUPPORT-ASSIST: SupportAssist server 'default' connection lost.
<189> Aug 21 07:46:26 CoreSwitch-1 TRAPMGR[trapTask]: traputil.c(721) 8890 %% Po32 is transitioned from the Learning state to the Forwarding state in instance 0
<189> Aug 21 07:46:26 CoreSwitch-1 TRAPMGR[trapTask]: traputil.c(721) 8889 %% Po32 is transitioned from the Forwarding state to the Blocking state in instance 0
<189> Aug 21 07:27:24 CoreSwitch-1 TRAPMGR[trapTask]: traputil.c(721) 8888 %% Po32 is transitioned from the Learning state to the Forwarding state in instance 0
<189> Aug 21 07:27:24 CoreSwitch-1 TRAPMGR[trapTask]: traputil.c(721) 8887 %% Po32 is transitioned from the Forwarding state to the Blocking state in instance 0