Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> a21a89c9427daf346a2d824ee38775a5366328fb3f95490ac667df70221fc265:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^