Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 88c94aaa7f94571450afc60ea63740a248c25d2bf5a82d4bf8ba9e6177c1b2b2:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^