Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 475e06b7ec598c07576f0a18efc0a1b0d7febc2c5dc6fda0287f60fda2329b15:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^