VGANoFrameBuffer not working with a lilygo VGA32 board V1.4

[OulanB]

After setting the rgb pins correctly (other examples are working)

I got at run :

Rebooting...
Guru Meditation Error: Core 1 panic'ed (LoadProhibited). Exception was unhandled.
Core 1 register dump:
PC : 0x400849ad PS : 0x00060033 A0 : 0x80080f36 A1 : 0x3ffbea00
A2 : 0x00000000 A3 : 0x3ffb214c A4 : 0xc000c000 A5 : 0x3ffbfd68
A6 : 0x3ffb2100 A7 : 0x00000026 A8 : 0x00000000 A9 : 0x00000020
A10 : 0x00000020 A11 : 0x000000fa A12 : 0x00000000 A13 : 0x3ffc0c30
A14 : 0x00000003 A15 : 0x00060023 SAR : 0x00000017 EXCCAUSE: 0x0000001c
EXCVADDR: 0x00000000 LBEG : 0x00000000 LEND : 0x00000000 LCOUNT : 0x00000000
Core 1 was running in ISR context:
EPC1 : 0x400849ad EPC2 : 0x00000000 EPC3 : 0x400eb1de EPC4 : 0x4008383b

ELF file SHA256: 0000000000000000

Backtrace: 0x400849ad:0x3ffbea00 0x40080f33:0x3ffbea20 0x40080fd9:0x3ffbea40 0x40083771:0x3ffbea60 0x400eb1db:0x3ffbc6b0 0x400e28ef:0x3ffbc6d0 0x400873e6:0x3ffbc6f0 0x40085f51:0x3ffbc710

board is ESP32 DEV MODULE PSRAM disabled
chip is esp32-pico-d4 (revision 1)
arduino is 1.8.19
esp32lib is 0.3.4

arduino install is Arduino15\packages\esp32\hardware\esp32\1.0.6

when commenting out protected virtual Color **allocateFrameBuffer() function,
there no panic message, but nothing is displayed ...

Olivier