ClosedBit error docs

CB_ERR_UNKNOWN_FUNCTION

Unknown function. The checker found a function call that is not built in and is not defined in this source or a loaded library.

Why it happens

The checker found a function call that is not built in and is not defined in this source or a loaded library.

How to fix it

Check spelling, add the required library, or define the function before calling it.

Copy-paste fix pattern
library CB-Render

fn main() {
    init_window(640, 360, "Window")
    clear(0x071018)
    swap_buffers_fast()
}
If the IDE reports a line number, fix that line first, then scan the previous line for an unclosed string, bracket, or block.