0014386:WARNING:gdbserver:Exception while target was running: STLink error (20): DP wait

Before hitting main(), I continuously get:
0011049:INFO:loader:Erased chip, programmed 272384 bytes (266 pages), skipped 2048 bytes (2 pages) at 33.00 kB/s
Resetting target with halt
Successfully halted device on reset
Image loaded: d:/ISENSE/AutoHoloDev/AutoHolo-Disco-L4R9I/BUILD/DISCO_L4R9I/ARMC6/AutoHolo-Disco-L4R9I.elf
Note: automatically using hardware breakpoints for read-only addresses.
[New Thread 536894588]
[New Thread 536880640]
[New Thread 536894656]
[New Thread 536894724]
[Switching to Thread 536894588]
Thread 2 “main” hit Breakpoint 1, 0x08036024 in main ()
0014386:WARNING:gdbserver:Exception while target was running: STLink error (20): DP wait
Traceback (most recent call last):
File “c:\Users\jbrosnahan\AppData\Local\Mbed Studio\mbed-studio-tools\python\lib\site-packages\pyocd\gdbserver\gdbserver.py”, line 609, in resume
if self.target.get_state() == Target.State.HALTED:
File “c:\Users\jbrosnahan\AppData\Local\Mbed Studio\mbed-studio-tools\python\lib\site-packages\pyocd\coresight\cortex_m.py”, line 831, in get_state
dhcsr = self.read_memory(CortexM.DHCSR)
File “c:\Users\jbrosnahan\AppData\Local\Mbed Studio\mbed-studio-tools\python\lib\site-packages\pyocd\coresight\cortex_m.py”, line 436, in read_memory
result = self.ap.read_memory(addr, transfer_size, now)
File “c:\Users\jbrosnahan\AppData\Local\Mbed Studio\mbed-studio-tools\python\lib\site-packages\pyocd\probe\stlink_probe.py”, line 255, in read_memory
result = conversion.byte_list_to_u32le_list(self._link.read_mem32(addr, 4, self._apsel))[0]
File “c:\Users\jbrosnahan\AppData\Local\Mbed Studio\mbed-studio-tools\python\lib\site-packages\pyocd\probe\stlink\stlink.py”, line 385, in read_mem32
return self._read_mem(addr, size, Commands.JTAG_READMEM_32BIT, self.MAXIMUM_TRANSFER_SIZE, apsel)
File “c:\Users\jbrosnahan\AppData\Local\Mbed Studio\mbed-studio-tools\python\lib\site-packages\pyocd\probe\stlink\stlink.py”, line 345, in _read_mem
raise self._ERROR_CLASSESstatus