IntegrationException.this - multiple declarations

Function IntegrationException.this

this (
  string msg,
  real resultEstimate,
  real errorEstimate,
  string file = __FILE__,
  ulong line = cast(ulong)__LINE__
);

Function IntegrationException.this

this (
  string msg,
  string extra,
  real resultEstimate,
  real errorEstimate,
  string file = __FILE__,
  ulong line = cast(ulong)__LINE__
);