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Warning: Trying to access array offset on value of type null in D:\laragon\laragon\www\titulo\app\number\convert.php on line 16

Fatal error: Uncaught TypeError: Luecano\NumeroALetras\NumeroALetras::toInvoice(): Argument #1 ($number) must be of type float, null given, called in D:\laragon\laragon\www\titulo\app\number\convert.php on line 28 and defined in D:\laragon\laragon\www\titulo\app\number\number\vendor\luecano\numero-a-letras\src\NumeroALetras.php:188 Stack trace: #0 D:\laragon\laragon\www\titulo\app\number\convert.php(28): Luecano\NumeroALetras\NumeroALetras->toInvoice(NULL, 2, 'BOLIVIANOS') #1 {main} thrown in D:\laragon\laragon\www\titulo\app\number\number\vendor\luecano\numero-a-letras\src\NumeroALetras.php on line 188