Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> c899cf0ad1a5152a3f4b074bdf2a8af6ded88ed88e2b4bd802640a7f0ef43828:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^