Transaction

[Error Code: 1101] error caused by: 1 error occurred:
	* transaction preprocess failed: [Error Code: 1101] cadence runtime error: Execution failed:
error: cannot find variable in this scope: `amount`
  --> d8186df8e2f216f5466a14c65634fce1e142736f910d31c4a861df5f7246ac67:42:46
   |
42 |         self.postBalance == self.preBalance - amount: "Transfer failed"
   |                                               ^^^^^^ not found in this scope