bad default constructor

[zhouronghua]

compiled failed with clang:
default constructor of 'Exception' is implicitly deleted because
base class 'std::runtime_error' has no default constructor

note: default constructor of 'InvalidOperationException' is implicitly
deleted
because base class '::gloo::Exception' has a deleted default constructor

default constructor of 'IoException' is implicitly deleted because
base class '::gloo::Exception' has a deleted default constructor

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[zhouronghua]

"https://code.facebook.com/cla" can not be opened