Not enough memory to create sprite

Hi. our ChatCube app sometimes produce error 0×82: Not enough memory to create sprite. I cant find any info about it in docs and what to do with that and how to avoid.
Could someone give a tips or any thoughts what could be wrong?
here is the part of code which sometimes produce this error:

mode = (os_mode)0x7860C051;

unsigned total_size = sizeof(osspriteop_area) + sizeof(osspriteop_header) +
(width * height * 4) + 2048;
sprbuffer = (osspriteop_area*)malloc(total_size);

sprheader = (osspriteop_header *)(sprbuffer + 1);
sprbuffer→used = 16;
sprbuffer→sprite_count = 0;
osspriteop_create_sprite(osspriteop_NAME,sprbuffer,“sprite1”,0,width,height,mode);

I don’t know what library you’re using, but something that leaps out at me…

Looking at it you are setting used (used?) to the usual offset of 16, and the sprite count to zero. However the first element in the array should be the total size of the sprite area, where is this being set?

You are also supposed to initialise the sprite area before creating a sprite:

https://www.riscosopen.org/wiki/documentation/show/OS_SpriteOp%209

Set the size of the area, and the offset to the first sprite (16) then call init. It’ll set up the other stuff so you can make use of the sprite area.

Why is the header being set as (sprbuffer + 1)? [and one what?]

this code is works but only sometimes rare happen such errors.
sprheader is used only for debug logging. it is a pointers calcing and the result is the pointer to the header of the first sprite

As Rick says, you MUST initialise the sprite area. Fully. Or you will get unpredictable behaviour.

Set sprbuffer→size=total_size and sprbuffer→first=16 before the first spriteop

See https://www.riscosopen.org/wiki/documentation/show/Format%20Of%20Sprite%20Area