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# Description of the issue
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Electrumx has one critical issue(https://github.com/kyuupichan/electrumx/issues/185), when servers started to get desynchronized with Crown chain after about a month of work and Electrum Crown wallet start to show that server is lagging
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Please note that on this problem is currently working Electrumx creator, so I will import changes after the final fix is done.
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But for now we need to maintain servers as soon as the problem occurs.
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# Identification of issue
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To be sure that you have the same problem as described in the issue above do the following steps:
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1. Type the following command to show server logs
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```
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journalctl -u electrumx.service --no-pager -n 100
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```
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where `electrumx.service` is the service name and it can be different for your case
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2. You will see the following lines in the logs:
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```
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electrumx_server.py[1755]: flush_id = pack('>H', self.flush_count)
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electrumx_server.py[1755]: struct.error: 'H' format requires 0 <= number <= 65535
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```
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# How to fix
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The following actions is needed to bring servers into the working state
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1. Download the python script from electrumx repo`(only python3.6 version is supported)`:
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```
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wget https://raw.githubusercontent.com/Crowndev/electrumx/crown/compact_history.py
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```
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2. Adapt it according to your configuration:
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```
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# Configure it for your case, the value should be the same as set in /etc/electrumx.conf
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environ['DB_DIRECTORY'] = '/db'
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```
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As marked in comment the value of DB_DIRECTORY should be taken from electrumx config file, which is mainly located in /etc/electrumx.conf
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3. Stop the electrumx server before running the script
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```
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systemctl stop electrumx.service
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```
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where `electrumx.service` is the service name
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4. Run the script
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```
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python compact_history.py
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```
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wait untill the script is finished, it may take long(up to 6 hour, depends on hardware capability)
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5. Rerun electrumx server
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```
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systemctl restart electrumx.service
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```
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6. Wait a minute and test that error lines are disappeared from the server log.
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```
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journalctl -u electrumx.service --no-pager -n 100
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```
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