Type Errors (E25xx)

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Code	Name	Description	Common Cause
E2501	IntegerOverflow	Integer overflow	Compile-time constant exceeds type range
E2502	IntegerUnderflow	Integer underflow	Compile-time constant below type minimum
E2503	DivisionByZero	Division by zero	Compile-time division by zero constant
E2504	ArrayOutOfBounds	Array index out of bounds	Compile-time index exceeds fixed array length
E2505	InvalidCast	Invalid type cast	Incompatible explicit cast (e.g., string to uint)
E2506	NullReference	Null reference	Accessing member on potentially null reference

Example: E2501 IntegerOverflow

error[E2501]: integer overflow: value 999999999999999999999 exceeds uint256 range
  --> MyContract.sol:8:20

Fix: Use a value within the valid range for the target type, or split the computation across multiple steps.