[ndnSIM] Error with Instantiating an object to call class DummyPib's function

[Walter Swift]

Dear everyone,

I'm trying to use dummy-keychain's function to make a key, the following is
a snippet of my program:
::ndn::security::DummyPib dp;
auto id = dp.getIdentities();

and receive an error message while compiling:
../src/ndnSIM/apps/ndn-producer.cpp: In member function ‘virtual void
ns3::ndn::Producer::StartApplication()’:
../src/ndnSIM/apps/ndn-producer.cpp:96:29: error: no matching function for
call to ‘ndn::security::DummyPib::DummyPib()’
   96 |   ::ndn::security::DummyPib dp;
      |                             ^~
In file included from ../src/ndnSIM/apps/ndn-producer.cpp:39:
../src/ndnSIM/utils/dummy-keychain.hpp:50:12: note: candidate:
‘ndn::security::DummyPib::DummyPib(const string&)’
   50 |   explicit DummyPib(const std::string& locator);
      |            ^~~~~~~~
../src/ndnSIM/utils/dummy-keychain.hpp:50:12: note:   candidate expects 1
argument, 0 provided

However, it has no problem when calling other class like Identity:
::ndn::security::pib::Identity id;
Please help me with this problem.

Sincerely yours,
Walter Swift
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