How do you resolve the following error: Error: Cannot find module '@openzeppelin/test-helpers' (when typing 'truffle test' in VSCode terminal)

Question

I am trying to create a blockchain project and as I type in the following: truffle test - in the VSCode IDE terminal, I get the following error:

Error: Cannot find module '@openzeppelin/test-helpers'

I am trying to create a blockchain supply chain project using Solidity programming language in VSCode IDE.

Answer 1

run

truffle compile --all
truffle migrate --reset

and it solve