Problem adding a tab


I would like to add a tab after the one (past times « temps passés »), I made an overload like that, but nothing is displayed. What is my mistake please? thank you.

 <extend target="//panel[name='timeSpentPanel']">
      <insert position="after">
        <panel name="filterPanel" title="filter">

use this target="//panel[@name=‹ timeSpentPanel ›]"
you forget to add @ sign before name in target.