Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 96da4bcf65fa1dfdafafd861ebe92774c526c06c43d5e36ea6d7d446b7826cc5:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^