Control block not found

[HaoYDai]

pyocd> read8 0x20000040 64
20000040:  40 00 00 20  40 00 00 20  30 00 00 00  0a 00 00 00    |@.. @.. 0.......|
20000050:  ac 25 00 20  78 13 00 20  2c 00 00 00  53 45 47 47    |.%. x.. ,...SEGG|
20000060:  45 52 20 52  54 54 00 00  00 00 00 00  02 00 00 00    |ER RTT..........|
20000070:  02 00 00 00  a4 39 01 08  10 08 00 20  00 04 00 00    |.....9..... ....|

0001975 I Target type is gd32f103tb [board]
0002045 I DP IDR = 0x1ba01477 (v1 rev1) [dap]
0002052 I AHB-AP#0 IDR = 0x24770011 (AHB-AP var1 rev2) [discovery]
0002059 I AHB-AP#0 Class 0x1 ROM table #0 @ 0xe00ff000 (designer=751 part=a98) [rom_table]
0002066 I [0]<e000e000:SCS v7-M class=14 designer=43b:Arm part=000> [rom_table]
0002070 I [1]<e0001000:DWT v7-M class=14 designer=43b:Arm part=002> [rom_table]
0002074 I [2]<e0002000:FPB v7-M class=14 designer=43b:Arm part=003> [rom_table]
0002078 I [3]<e0000000:ITM v7-M class=14 designer=43b:Arm part=001> [rom_table]
0002083 I [4]<e0040000:TPIU M3 class=9 designer=43b:Arm part=923 devtype=11 archid=0000 devid=ca0:0:0> [rom_table]
0002088 I CPU core #0: Cortex-M3 r2p1, v7.0-M architecture [cortex_m]
0002089 I Setting core #0 (Cortex-M3) default reset sequence to ResetSystem [pack_target]
0002090 I 4 hardware watchpoints [dwt]
0002093 I 6 hardware breakpoints, 4 literal comparators [fpb]
0002123 C Control block not found [__main__]

The control block id exists but can't be found