# Zcash server won't start **URL:** \ **Category:** zcashd client\ **Created:** [June 24, 2018, 7:45pm UTC](https://forum.zcashcommunity.com/t/zcash-server-wont-start/29860 "2018-06-24T19:45:37Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![chrisimnida](https://avatars.discourse-cdn.com/v4/letter/c/eb8c5e/32.png) [@chrisimnida](https://forum.zcashcommunity.com/u/chrisimnida)\ **Post date:** [June 24, 2018, 7:45pm UTC](https://forum.zcashcommunity.com/t/zcash-server-wont-start/29860/1 "2018-06-24T19:45:37Z")
Hi, haven’t started my VirtualBox Ubuntu for like a year or two, because that’s where my Zcash wallet is located. I’m sure everything is outdated, but I’m not experienced with Ubuntu so I don’t know what to do. What I do is run the commands (this has always worked in the past): cd zcash ./src/zcashd -daemon then it says: Zcash server starting zcashd: wallet/wallet.cpp:1780: int CWallet::ScanForWalletTransactions(CBlockIndex\*, bool): Assertion `pcoinsTip-\>GetAnchorAt(pindex-\>hashAnchor, tree)’ failed. And if I try to open ZCash Swing Wallet UI 0.34 (beta), it gives wallet communication error which basically says “make sure that zcashd server has started”. Obviously makes sense to me, so how can I connect to the server? Looking around the web, someone suggested to add line rpcallowip=127.0.0.1 in the zcash.conf, but no luck so far. ---
**Author:** ![garethtdavies](https://sea2.discourse-cdn.com/zcash/user_avatar/forum.zcashcommunity.com/garethtdavies/32/210_2.png) [@garethtdavies](https://forum.zcashcommunity.com/u/garethtdavies)\ **Post date:** [June 24, 2018, 8:10pm UTC](https://forum.zcashcommunity.com/t/zcash-server-wont-start/29860/2 "2018-06-24T20:10:22Z")
You should upgrade as per [Home · zcash/zcash Wiki · GitHub](https://github.com/zcash/zcash/wiki/1.0-User-Guide#upgrading) as you are going to need to do this regardless with Overwinter activating tomorrow. Just make a backup of wallet.dat first.