** Using WeBWorK **

We have the error in subject when try to add a question on the quiz. I try the next URL but I have also the error. https://mydomain/webwork2/instructorXMLHandler
I have the error below

WeBWorK error

An error occured while processing your request. For help, please send mail to this site's webmaster (webmaster@localhost), including all of the following information as well as what what you were doing when the error occured.

Fri Oct 20 13:51:15 2017

Warning messages

Use of uninitialized value in anonymous hash ({}) at /opt/webwork/webwork2/lib/WeBWorK/ContentGenerator/instructorXMLHandler.pm line 182. Use of uninitialized value in anonymous hash ({}) at /opt/webwork/webwork2/lib/WeBWorK/ContentGenerator/instructorXMLHandler.pm line 182.
etc ...

Error messages

Error message for command: HASH(0x563e40623af8)
faultcode: Client
faultstring: Denied access to method (methodName) in class (main) at /usr/share/perl5/SOAP/Lite.pm line 2827.
End error message
Call stack

The information below can help locate the source of the problem.

in WeBWorK::ContentGenerator::instructorXMLHandler::content called at line 233 of /opt/webwork/webwork2/lib/WeBWorK/ContentGenerator.pm
in WeBWorK::ContentGenerator::go called at line 382 of /opt/webwork/webwork2/lib/WeBWorK.pm
Request information

Need help please.