Hello, I'm using STM32H743IIT6 with LTDC configurations and when I'm using internal clock, LTDC works fine but when I use external crystal nothing works . What can be the problem?

[NBehe.1]

And when I'm going to find the problems using DEBUG mode it gives me this error:

Cannot access Memory

*** error 122: AGDI: memory read failed (0xFFFFFFFE)

Cannot access Memory

And this are is LTDC configuration and Clock configuration:

[MM..1]

?? Frame buffer start address 0 ?? and why two layers

for your size and dot clock frame rate is 90Hz , isnt to big? Try change 12Mhz to 8MHz...