Syntax error near unexpected token newli ne lỗi năm 2024

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June 6, 2018

Hi!

There's a hidden newline character in you string. Try not to copy it but write it yourself, character by character.

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The JavaScript exceptions "unexpected token" occur when a specific language construct was expected, but something else was provided. This might be a simple typo.

SyntaxError: expected expression, got "x" SyntaxError: expected property name, got "x" SyntaxError: expected target, got "x" SyntaxError: expected rest argument name, got "x" SyntaxError: expected closing parenthesis, got "x" SyntaxError: expected '=>' after argument list, got "x"

A specific language construct was expected, but something else was provided. This might be a simple typo.

For example, when chaining expressions, trailing commas are not allowed.

for (let i = 0; i < 5,; ++i) {
  console.log(i);
}
// Uncaught SyntaxError: expected expression, got ';'

Correct would be omitting the comma or adding another expression:

for (let i = 0; i < 5; ++i) {
  console.log(i);
}

Sometimes, you leave out parentheses around if statements:

function round(n, upperBound, lowerBound) {
  if (n > upperBound) || (n < lowerBound) { // Not enough parenthese here!
    throw new Error(`Number ${n} is more than ${upperBound} or less than ${lowerBound}`);
  } else if (n < (upperBound + lowerBound) / 2) {
    return lowerBound;
  } else {
    return upperBound;
  }
} // SyntaxError: expected expression, got '||'

The parentheses may look correct at first, but note how the || is outside the parentheses. Correct would be putting parentheses around the ||:

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I have cloned the "robot_localization" package and made it catkin but when I am trying to run the nodes I am getting an error like

syntax error near unexpected token 'newline'

'newline'

my launch file are as following

ekf_template.launch

<launch>
  <node pkg="robot_localization" type="ekf_localization_node" name="ekf_se" clear_params="true">
    clear_params="true">
    <rosparam command="load" file="$(find robot_localization)/params/ekf_template.yaml" />
  </node>
</launch>

ukf_template.launch

<launch>
  <node pkg="robot_localization" type="ukf_localization_node" name="ukf_se" clear_params="true">
    clear_params="true">
    <rosparam command="load" file="$(find robot_localization)/params/ukf_template.yaml" />
  </node>

Can anyone please tell me how to resolve this issue ?

Thanks

1 Answer

Your ukf_template.launch file is missing the closing launch tag. It should be

<launch>
  <node pkg="robot_localization" type="ukf_localization_node" name="ukf_se" clear_params="true">
    <rosparam command="load" file="$(find robot_localization)/params/ukf_template.yaml" />
  </node>
</launch> <!-- This was missing -->

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