Python raises standard built-in exceptions rather than named IDs: Exception Condition TypeError Axis mismatch at kernel.run(). This error also occurs when axis= or set_axis() receives a non-varray.axis value. AttributeError Sideband field not enabled by the axis config (for example, reading arr.tuser when w_user == 0). OverflowError Data bus wider than 64 bytes (tkeep/tstrb masks only support up to 64 bits).