I have created a node.js project, within which I have created a truffle directory and initialised its project. I have installed the openzeppelin (npm install @openzeppelin/contracts) library in this truffle project directory, but nothing appears to have been installed, although I did not received any error during the install process. The import statement in my project displays the error hereafter:
import "@openzeppelin/contracts/token/ERC721/ERC721Full.sol";
Source "@openzeppelin/contracts/token/ERC721/ERC721Full.sol" not found: File import callback not supported
Try this: