Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 292b2dbee527f84781ad7013dc30287af148a9dd371bec163a68f818213bc020:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^