Verifying on Polygon issue

ParserError: Source "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol" not found: File import callback not supported
--> myc:18:1:
|
18 | import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol"
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

ParserError: Source "@openzeppelin/contracts/access/Ownable.sol" not found: File import callback not supported
--> myc:19:1:
|
19 | import "@openzeppelin/contracts/access/Ownable.sol"
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^