PARA_ERROR(BTR_EOF, "buffer tree: end of file"), \
PARA_ERROR(BTR_NAVAIL, "btr node: value currently unavailable"), \
PARA_ERROR(BTR_NO_CHILD, "btr node has no children"), \
PARA_ERROR(BTR_EOF, "buffer tree: end of file"), \
PARA_ERROR(BTR_NAVAIL, "btr node: value currently unavailable"), \
PARA_ERROR(BTR_NO_CHILD, "btr node has no children"), \