Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 308f44670842ddddc17486c6046eaf94eec2fa97863c3c3d83fd1f1ecbbe4c40:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^