Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 24c6da74d526721fdade5da27f76ec8a1730e1c5089f056cfe4d398bb61fee3f:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^