Unescaped backslashes are Deprecated at mobility.prf:1 - symbian

i am new to Qt for Symbian Development and i am stuck at one problem that when i tried to build my Qt Project then three Warnings are occurred there which stops the build process:
WARNING:
D:\QtSDK\Simulator\Qt\msvc2008\mkspecs\features\mobility.prf:1:
Unescaped backslashes are deprecated. WARNING:
c:\QtSDK\Simulator\Qt\msvc2008\mkspecs\features\mobility.prf:1:
Unescaped backslashes are deprecated. WARNING:
c:\QtSDK\Simulator\Qt\msvc2008\mkspecs\features\mobility.prf:1:
Unescaped backslashes are deprecated.
Please help me to rectify this issue that why these warnings are occurring. Thanks

I have resolved it....
By just uninstalling the Qt and then re-install it...

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Since then I see following error during the build and it also produces
ajcore files
I have removed my .gradle caches and done build and still see this error.
Anybody else seen this before, how do I fix it?
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In my case, removing the Hugo logging plugin fixed the issue.
Check in your gradle file if you have it configured.
classpath 'com.jakewharton.hugo:hugo-plugin:1.2.1'
It happens because some plugin (added by you) use libs:
org.aspectj:aspectjtools
or
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I'm trying to get the following codebase:
https://github.com/andreliem/vue-nativescript-getting-started
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I am facing error of evaluating addListner I also submit it in the issue
4.0.0-beta.30 is broken as the last commit says
update dependencies, bump version - don't use, errors are possible!
4.0.0-beta.28 is broken too. Use 4.0.0-beta.27 instead.
In package.json, make sure you have exactly this:
"react-native-router-flux": "4.0.0-beta.27"
Don't include ^ otherwise your package manager will still install the .28 version (unless you have a yarn.lock at .27).

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Has anyone had any luck with this?
You will have more answers if you ask in Magma mailing list or even in Pharo, but not here.