# Missing function: xsbwtest & server crash
**URL:** https://community.wowza.com/t/missing-function-xsbwtest-server-crash/40149
**Category:** Wowza Streaming Engine
**Created:** [December 24, 2014, 2:39am UTC](https://community.wowza.com/t/missing-function-xsbwtest-server-crash/40149 "2014-12-24T02:39:30Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@dogan\_dogan](https://community.wowza.com/u/dogan_dogan)
#### Post date: [December 24, 2014, 2:39am UTC](https://community.wowza.com/t/missing-function-xsbwtest-server-crash/40149/1 "2014-12-24T02:39:30Z")
Dear Wowza Community,
i have several warning in my log file:
1.) (many of this one) : **Missing function: xsbwtest**
2.) Zero sized function (client:1507320752:FMLE/3.0 (compatible; FMSc/1.0)): type:20 size:0:
do you have any idea why i got my log file spammed with this warnings?
also my wowza server is crashing every 7-10 days ( the server need to be HW resetted its not reachable anymore ) :(:(☹
i have every day about 150 streams incoming and about 800-1000 viewer in total ( peak)
thank you a lot for your time and help.
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### Author:  [@sal\_jefferson](https://community.wowza.com/u/sal_jefferson)
#### Post date: [December 24, 2014, 6:30am UTC](https://community.wowza.com/t/missing-function-xsbwtest-server-crash/40149/2 "2014-12-24T06:30:45Z")
Hello there.
The server may be crashing because it is running out of memory due to excessive error logging compounded by heavy traffic.
The error seems to be related to a custom module. Did you recently upgrade Wowza versions? Is this a module you were using in a previous version of Wowza?
You can start Wowza in stand-alone mode and view the output in the console. This will give you a better idea of what is going on.
Please let us know what other information the console is reporting.
Thank you.
Salvadore