Fatal error: Uncaught TypeError: Argument 1 passed to ERC20\ERC20_Token::balanceOf() must be of the type string, null given, called in /www/wwwroot/default/index.php on line 29 and defined in /www/wwwroot/default/vendor/aytaceminoglu/erc20-php/src/ERC20_Token.php:118 Stack trace: #0 /www/wwwroot/default/index.php(29): ERC20\ERC20_Token->balanceOf(NULL) #1 {main} thrown in /www/wwwroot/default/vendor/aytaceminoglu/erc20-php/src/ERC20_Token.php on line 118