Android Studio:error: illegal character: '\u2028'
<p>I am trying to do a JSONObject request: </p>

<pre><code>final String URL = "https://some/url";

// Post params to be sent to the server
HashMap&lt;String, String&gt; params = new HashMap&lt;String, String&gt;();
params.put("param1", param1);
 params.put("param2", param2);
 params.put("param3", param3);     
params.put("param4", param4);


JsonObjectRequest req = new JsonObjectRequest(URL, new JSONObject(params), new Response.Listener&lt;JSONObject&gt;() {
    @Override
    public void onResponse(JSONObject response) {
        try {
            VolleyLog.v("Response:%n %s", "läuft");
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }
}, new Response.ErrorListener() {
    @Override
    public void onErrorResponse(VolleyError error) {
        VolleyLog.e("Error: ", error.getMessage());
    }
});

// add the request object to the queue to be executed
NetworkController.getInstance().addToRequestQueue(req);
</code></pre>

<p>I cannot compile the project because I get a syntax error for the params: </p>

<blockquote>
  <p>Error:(144, 9) error: illegal character: '\u2028'</p>
</blockquote>

<p>How can I fix that?</p>