Error saving invoice

this is the error received

  ["Errors"]=>
  array(1) {
    [0]=>
    array(9) {
      ["Receiver"]=>
      string(0) ""
      ["Category"]=>
      string(11) "Application"
      ["Domain"]=>
      string(8) "PLATFORM"
      ["ErrorID"]=>
      string(6) "580001"
      ["ExceptionID"]=>
      string(0) ""
      ["Message"]=>
      string(63) "Invalid request: Data validation warning(line 1, col 881): null"
      ["Parameter"]=>
      string(46) "Data validation warning(line 1, col 881): null"
      ["Severity"]=>
      string(5) "Error"
      ["Subdomain"]=>
      string(11) "Application"
    }
  }