Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> d1f919612d07b1c7085d31f5e3201ccd2fcbba11eaf66c0f7eee6017b51d06d0:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^