Description
I have been working on a project on VS sim.
then ported it successfully on the esp32.
but I had to update the LVGL library for the esp32, To get the full Arabic support that I and MR. Gabor worked on the past month.-by manually copying the version I used at VS-
and it works fine till I try to select the third tap.
then it crashes half the way in.
producing this error.
Error: _lv_mem_buf_get (lv_mem.c #539 _lv_mem_buf_get())
Error: No free buffer. Increase LV_DRAW_BUF_MAX_NUM. (0x00000000) (lv_debug.c #127 lv_debug_log_error())
I don’t know which buffer is this and how to control it.
it is weird because the Arabic processing shouldn’t make that much of a difference.
What have you tried so far?
doubled the memory size for lv_mem_malloc.
it was 32kb. making it 64 didn’t help.
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I increased the buffer display size from display_width* 40 to display_width* 64.
and it also didn’t help.
help needed
cuz I still need to add items to the screen.
and this project is smaller -I believe- than the out of the box demo.
and the demo works fine.
I am afraid because I won’t be able to change the esp32 to any other platform. 
I have never seen anyone encounter this error with a released version, but try #define LV_MEM_BUF_MAX_NUM 32 in your lv_conf.h file.
These buffers are separate from the heap; that’s why increasing that did not solve the error.
yes, this is not a released version.
can you tell me what buffer is this?
it is kinda feel that LVGL saves everything in memory even if it is offscreen.
is there is a way to prevent this.
what are the best practices in such situation?
what items or features that I can cut of the library.
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OH. THANKS GOD.
your solution worked 
but I still want to understand what is happening under the hood.
if you ever though of making a course about software engineering.
giving this library as an example, I will be the first to buy.
cheers
and many thanks
and is it a bad thing that I encountered this error?
even if it now fixed?
what does it have to do with released version or a developer one?
Now, It is weird because this buffer has nothing to do with the Esp32 memory
because it is the same at VS and this error never happened there
I suspect that Arabic characters require a larger number of these buffers than normal text, due to the added processing complexity. We may need to increase the default value or at least add a note to increase this if Arabic text is being used.
no, it was working fine with the default number at VS with the same project. 
don’t you know what are these buffer for?
maybe Mr @kisvegabor can help?
