Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 5c2c36342b7647de8e51ecb8ad1c8907a367db9dded2aa6a0a1d5e053e13cadf:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^