Labels can't be edited

Hi guys, I tried editing the labels on the SuiteCRM page and it keeps giving me this error.

C:\WampDeveloper\Websites\localhost\webroot\SuiteCRM\modules\ModuleBuilder\views\view.modulefield.php on line 154
{“east”:{“title”:“Edit Field”,“crumb”:"",“content”:"

Please help

Can kindly provide more information regarding this error?
For example, output of console tab at chrome or firefox.
Step by step to reproduce such error.