# Block Header Not Found?
**URL:** https://forum.grin.mw/t/block-header-not-found/1043
**Category:** Tech Support
**Created:** [October 27, 2018, 3:52am UTC](https://forum.grin.mw/t/block-header-not-found/1043 "2018-10-27T03:52:10Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@GerdaCurd](https://forum.grin.mw/u/GerdaCurd)
#### Post date: [October 27, 2018, 3:52am UTC](https://forum.grin.mw/t/block-header-not-found/1043/1 "2018-10-27T03:52:10Z")
Built a new node from scratch on Google Cloud. Downloaded everything successfully, then entered `grin` and the app started up and started syncing. Left to make some tea while the node was syncing, but when I came back it wasn’t working, so I entered `grin` again and got this error message:
`Thread 'main' panicked with message: "called`Result::unwrap()`on an`Err`value: Chain(Error { inner: NotFoundErr("BLOCK HEADER: 02c918ff") Store Error: NotFoundErr("BLOCK HEADER: 02c918ff") })"`
Anyone know why this might happen? Thanks
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### Author:  [@hashmap](https://forum.grin.mw/u/hashmap)
#### Post date: [October 27, 2018, 8:24am UTC](https://forum.grin.mw/t/block-header-not-found/1043/2 "2018-10-27T08:24:05Z")
It’s a bug, if the initial sync is not finished some data is corrupted. while it exists a workaround is to remove the chain data (rm -rf ~/.grin/chain\_data ) and start ovet.
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### Author:  [@GerdaCurd](https://forum.grin.mw/u/GerdaCurd)
#### Post date: [October 28, 2018, 12:10am UTC](https://forum.grin.mw/t/block-header-not-found/1043/3 "2018-10-28T00:10:37Z")
That fixed it. Thanks!