My code (par file attached) is dying in regrid.cc with this error message:

terminate called after throwing an instance of 'std::out_of_range'   what():  vector::_M_range_check: __n (which is 0) >= this->size() (which is 0)

The relevant code is below. I'm not sure what I'm doing wrong. Any ideas? Thanks.

} else {           // The level did not actually change: re-use the old domain           // decomposition

for (int m = 0; m < maps; ++ m) { superregsss.at(m).at(rl).swap(old_superregsss.at(m).at(rl));             int const ml = 0; regsss.at(m).at(rl).swap(old_regssss.at(m).at(ml).at(rl)); // <-- dying here           }

} // if level did change       } // for rl

--Steve