Transaction simulation failed: Attempt to load a program that does not exist

[Mike Heavers]

Following this tutorial

I have followed all of the steps up to the point of building the counter code, including having a running localhost validator.

I have taken the output of solana address -k target/deploy/mysolanaapp-keypair.json

and input it in lib.rs and anchor.toml as instructed, and get the following after running anchor build and then anchor test:

mysolanaapp
Transaction simulation failed: Attempt to load a program that does not exist

[Dennis Bagwis Delrosario]

You should update the program address in anchor.toml file at line 2 with your contract address.