Copy-paste fix pattern
fn main() {
string text = "125"
u256 value = parse_u256_or(text, zero)
save value
}Why it happens
A value was passed where the target function, variable, or operator expected a different type.
How to fix it
Convert explicitly with parse helpers or to_string, and keep u256, i256, f64, string, and bool lanes separate.
If the IDE reports a line number, fix that line first, then scan the previous line for an unclosed string, bracket, or block.