Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 5cf884ccbf752e66c9cf0c62598d93c82ef2d5613d8f4b7227d8c8dd601f36af:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^