# Mautic errors after migration
**URL:** https://forum.mautic.org/t/mautic-errors-after-migration/6789
**Category:** Product Support
**Created:** [December 8, 2016, 7:45am UTC](https://forum.mautic.org/t/mautic-errors-after-migration/6789 "2016-12-08T07:45:54Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@chizuokagmail-com](https://forum.mautic.org/u/chizuokagmail-com)
#### Post date: [December 8, 2016, 7:45am UTC](https://forum.mautic.org/t/mautic-errors-after-migration/6789/1 "2016-12-08T07:45:54Z")
Hi, i updated my mautic to the very latest from Server A, then copied over everything to Server B, Server B already has an existing Mautic 2.3 running that was installed directly on that server, yet the second instance of mautic which was migrated fails to run with the following errors
Code:
#5 /home/rapidfyc/public\_html/chevage.com/marketing/app/AppKernel.php(488): SymfonyComponentDependencyInjectionContainerBuilder-\>compile() #6 /home/rapidfyc/public\_html/chevage.com/marketing/app/AppKernel.php(249): AppKernel-\>initializeContainer() #7 /home/rapidfyc/public\_html/chevage.com/marketing/app/AppKernel.php(109): AppKernel-\>boot() #8 /home/rapidfyc/public\_html/chevage.com/marketing/app/middlewares/CORSMiddleware.php(92): AppKernel-\>handle(Object(SymfonyComponentHttpFoundationRequest), 1, true) #9 /home/rapidfyc/public\_html/chevage.com/marketing/app/middlewares/CatchExceptionMiddleware.php(44): MauticMiddlewareCORSMiddleware-\>handle(Object(SymfonyComponentHttpFoundationRequest), 1, true) #10 /home/rapidfyc/public\_html/chevage.com/marketing/app/middlewares/VersionCheckMiddleware.php(57): MauticMiddlewareCatchExceptionMiddleware-\>handle(Object(SymfonyComponentHttpFoundationRequest), 1, true) #11 /home/rapidfyc/public\_html/chevage.com/marketing/vendor/stack/builder/src/Stack/StackedHttpKernel.php(23): MauticMiddlewareVersionCheckMiddleware-\>handle(Object(SymfonyComponentHttpFoundationRequest), 1, true) #12 /home/rapidfyc/public\_html/chevage.com/marketing/vendor/stack/run/src/Stack/run.php(13): StackStackedHttpKernel-\>handle(Object(SymfonyComponentHttpFoundationRequest)) #13 /home/rapidfyc/public\_html/chevage.com/marketing/index.php(32): Stackrun(Object(StackStackedHttpKernel)) #14 {main}
Could anyone help please?
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### Author:  [@chizuokagmail-com](https://forum.mautic.org/u/chizuokagmail-com)
#### Post date: [December 8, 2016, 7:45am UTC](https://forum.mautic.org/t/mautic-errors-after-migration/6789/2 "2016-12-08T07:45:54Z")
Hi, i updated my mautic to the very latest from Server A, then copied over everything to Server B, Server B already has an existing Mautic 2.3 running that was installed directly on that server, yet the second instance of mautic which was migrated fails to run with the following errors
`#5 /home/rapidfyc/public_html/chevage.com/marketing/app/AppKernel.php(488): SymfonyComponentDependencyInjectionContainerBuilder->compile()
#6 /home/rapidfyc/public_html/chevage.com/marketing/app/AppKernel.php(249): AppKernel->initializeContainer()
#7 /home/rapidfyc/public_html/chevage.com/marketing/app/AppKernel.php(109): AppKernel->boot()
#8 /home/rapidfyc/public_html/chevage.com/marketing/app/middlewares/CORSMiddleware.php(92): AppKernel->handle(Object(SymfonyComponentHttpFoundationRequest), 1, true)
#9 /home/rapidfyc/public_html/chevage.com/marketing/app/middlewares/CatchExceptionMiddleware.php(44): MauticMiddlewareCORSMiddleware->handle(Object(SymfonyComponentHttpFoundationRequest), 1, true)
#10 /home/rapidfyc/public_html/chevage.com/marketing/app/middlewares/VersionCheckMiddleware.php(57): MauticMiddlewareCatchExceptionMiddleware->handle(Object(SymfonyComponentHttpFoundationRequest), 1, true)
#11 /home/rapidfyc/public_html/chevage.com/marketing/vendor/stack/builder/src/Stack/StackedHttpKernel.php(23): MauticMiddlewareVersionCheckMiddleware->handle(Object(SymfonyComponentHttpFoundationRequest), 1, true)
#12 /home/rapidfyc/public_html/chevage.com/marketing/vendor/stack/run/src/Stack/run.php(13): StackStackedHttpKernel->handle(Object(SymfonyComponentHttpFoundationRequest))
#13 /home/rapidfyc/public_html/chevage.com/marketing/index.php(32): Stackrun(Object(StackStackedHttpKernel))
#14 {main}`
Could anyone help please?
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### Author:  [@chizuokagmail-com](https://forum.mautic.org/u/chizuokagmail-com)
#### Post date: [December 9, 2016, 8:18am UTC](https://forum.mautic.org/t/mautic-errors-after-migration/6789/3 "2016-12-09T08:18:39Z")
oh no… anyone could help out here?
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### Author:  [@chizuokagmail-com](https://forum.mautic.org/u/chizuokagmail-com)
#### Post date: [December 27, 2016, 7:16am UTC](https://forum.mautic.org/t/mautic-errors-after-migration/6789/4 "2016-12-27T07:16:01Z")
I managed to solve the above error but something else came out now
thrown in /home/rapidfyc/public\_html/petbacker.com/marketing/vendor/stack/run/src/Stack/run.php on line 14
[27-Dec-2016 04:44:05 UTC] PHP Fatal error: Uncaught Error: Call to a member function send() on null in /home/rapidfyc/public\_html/petback$
Stack trace:
#0 /home/rapidfyc/public\_html/petbacker.com/marketing/index.php(32): Stackrun(Object(StackStackedHttpKernel))
#1 {main}
thrown in /home/rapidfyc/public\_html/petbacker.com/marketing/vendor/stack/run/src/Stack/run.php on line 14
Permissions are correct… app cache cleared… im stuck…