Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> ce4ef72ac46c917886796fdf1f1cb903febc10a4600e1b93dcb9aac13cb28d53:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^