Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 4fa0e5767db212a0c7d56fcd078a094b165e28f9cf2188f8f110bb3ff7df7c9d:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^