Hi all.

I'm using the Espressif DevKitC with ESP32-WROVER-B module.
I'm using this micropython version: esp32spiram-20190529-v1.11.bin

I'm trying this code:

from machine import UART
uart = UART(1, 115200)

First line, the import, works fine. But the second line of code show this error and after micropython is rebooted:

I (31142) uart: ALREADY NULL
Guru Meditation Error: Core 0 panic'ed (LoadProhibited). Exception was unhandled.

The complete output is this:

from machine import UART
uart = UART(1, 115200)
I (335976) uart: ALREADY NULL
Guru Meditation Error: Core 0 panic'ed (LoadProhibited). Exception was unhandled.
Core 0 register dump:
PC : 0x400d3e80 PS : 0x00060730 A0 : 0x800dd94e A1 : 0x3ffc1af0
A2 : 0x0000044d A3 : 0x3ff49054 A4 : 0x00000009 A5 : 0xffffffff
A6 : 0xffffffff A7 : 0x00000012 A8 : 0x800d3e80 A9 : 0x3ffc1ad0
A10 : 0xcccccccc A11 : 0x00060723 A12 : 0x00060720 A13 : 0x00000000
A14 : 0xffffffff A15 : 0x00000012 SAR : 0x00000017 EXCCAUSE: 0x0000001c
EXCVADDR: 0xcccccccd LBEG : 0x400972ac LEND : 0x400972b7 LCOUNT : 0xffffffff

Backtrace: 0x400d3e80:0x3ffc1af0 0x400dd94b:0x3ffc1b10 0x400df8d1:0x3ffc1b40 0x400dc381:0x3ffc1b60 0x400e95fd:0x3ffc1b80 0x400e05a4:0x3ffc1c20 0x400dc519:0x3ffc1c80 0x400dc546:0x3ffc1ca0 0x400f9a42:0x3ffc1cc0 0x400f9c9c:0x3ffc1d60 0x400f1714:0x3ffc1da0 0x40092e35:0x3ffc1dd0

Rebooting...
ets Jun 8 2016 00:22:57

rst:0xc (SW_CPU_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:2
load:0x3fff0018,len:4
load:0x3fff001c,len:4928
ho 0 tail 12 room 4
load:0x40078000,len:10188
load:0x40080400,len:6736
entry 0x400806e8
I (501) spiram: Found 64MBit SPI RAM device
I (501) spiram: SPI RAM mode: flash 40m sram 40m
I (501) spiram: PSRAM initialized, cache is in low/high (2-core) mode.
I (507) cpu_start: Pro cpu up.
I (511) cpu_start: Application information:
I (516) cpu_start: Compile time: 07:47:57
I (521) cpu_start: Compile date: May 29 2019
I (526) cpu_start: ESP-IDF: v3.3-beta1-268-g5c88c5996
I (533) cpu_start: Starting app cpu, entry point is 0x40082e48
I (524) cpu_start: App cpu up.
I (1398) spiram: SPI SRAM memory test OK
I (1399) heap_init: Initializing. RAM available for dynamic allocation:
I (1399) heap_init: At 3FFAE6E0 len 00001920 (6 KiB): DRAM
I (1405) heap_init: At 3FFB9DD0 len 00026230 (152 KiB): DRAM
I (1412) heap_init: At 3FFE0440 len 00003AE0 (14 KiB): D/IRAM
I (1418) heap_init: At 3FFE4350 len 0001BCB0 (111 KiB): D/IRAM
I (1424) heap_init: At 40097B1C len 000084E4 (33 KiB): IRAM
I (1431) cpu_start: Pro cpu start user code
I (107) cpu_start: Starting scheduler on PRO CPU.
I (0) cpu_start: Starting scheduler on APP CPU.
MicroPython v1.11 on 2019-05-29; ESP32 module with ESP32
Type "help()" for more information.

What is wrong?

Thank you so much.