2015-07-17 22:21:35: ERROR[main]: UNRECOVERABLE error occurred. Stopping server. Please fix the following error:
2015-07-17 22:21:35: ERROR[main]: ...test-git-repos/minetest/bin/../builtin/game/register.lua:330: assertion failed!
2015-07-17 22:21:35: ERROR[main]: stack traceback:
2015-07-17 22:21:35: ERROR[main]: 	[C]: in function 'assert'
2015-07-17 22:21:35: ERROR[main]: 	...test-git-repos/minetest/bin/../builtin/game/register.lua:330: in function <...test-git-repos/minetest/bin/../builtin/game/register.lua:329>

In thread b3d1e780:
/home/chris/Desktop/minetest-git-repos/minetest/src/server.cpp:505: void Server::step(float): A fatal error occurred: ...test-git-repos/minetest/bin/../builtin/game/register.lua:330: assertion failed!
stack traceback:
	[C]: in function 'assert'
	...test-git-repos/minetest/bin/../builtin/game/register.lua:330: in function <...test-git-repos/minetest/bin/../builtin/game/register.lua:329>
Debug stacks:
DEBUG STACK FOR THREAD a87f9b40:
#0  virtual void* EmergeThread::Thread()
(Leftover data: #1  MapBlock* ServerMap::loadBlock(v3s16))
(Leftover data: #2  void ServerMap::loadBlock(std::string*, v3s16, MapSector*, bool))
DEBUG STACK FOR THREAD a95fdb40:
#0  virtual void* UpdateThread::Thread()
DEBUG STACK FOR THREAD aa5feb40:
#0  virtual void* UpdateThread::Thread()
DEBUG STACK FOR THREAD b1cffb40:
#0  virtual void* ServerThread::Thread()
#1  void Server::Receive()
(Leftover data: #2  virtual void ServerEnvironment::step(float))
(Leftover data: #3  void RemoteClient::GetNextBlocks(ServerEnvironment*, EmergeManager*, float, std::vector<PrioritySortedBlockTransfer>&))
(Leftover data: #4  void Server::SendBreath(irr::u16, irr::u16))
(Leftover data: #5  bool getCraftingResult(Inventory*, ItemStack&, std::vector<ItemStack>&, bool, IGameDef*))
DEBUG STACK FOR THREAD b3d1e780:
#0  int main(int, char**)
#1  void Server::step(float)
(Leftover data: #2  virtual void ClientEnvironment::step(float))
(Leftover data: #3  void Client::Receive())
(Leftover data: #4  void Client::ProcessData(NetworkPacket*))
(Leftover data: #5  void MeshUpdateQueue::addBlock(v3s16, MeshMakeData*, bool, bool))