Why do I always get R error in android 3.1.2? [closed] - java

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This is the error message:
AAPT2 error: check logs for details
before the above error, I have cleaned up the project from build.
How can I solve this?

Try re-importing the "R" file and re-building the project.

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error: resource android:attr/dialogCornerRadius not found [closed]

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Closed 1 year ago.
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I wanna run an app from android studio, but i give these errors
How can i solve it?
(i just installed androidStudio)photo errors
Add this to your build.gradle file:
implementation "androidx.appcompat:appcompat:1.3.1"

No variants found for 'app'. Check build files to ensure at least one variant exists: Android Studio [closed]

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Closed 2 years ago.
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I am getting an error in my project, No variants found for 'app'. Check build files to ensure at least one variant exists.
Screenshot
your gradle build may have failed. make sure you have build.gradle, open the file and do Sync now, look for errors to tell you what is wrong.

delete tokens not detecting by eclipse what might be the solution? [closed]

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Closed 5 years ago.
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Eclipse doesn't detecting the errors
Your source file is not treated as java source
Please config you java source path in the Project Properties tab.
The source with an icon looks like this one:

Error while opening dbeaver.. "See the log file .dbeaver/.metadata/.log [closed]

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Closed 1 year ago.
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dbeaver was working fine in my system.But,suddenly it is giving an error "See the log file /home/system/.dbeaver/.metadata/.log". Please,can someone help me to resolve this issue?
It might be the case that jdk is changed. Try moving the jdk if so from /Library/Java/JavaVirtualMachines to another location. This happened with me when I installed jdk11 and moving it, resolved my issue.

Why does it throw ClassNotFoundException when I build with spring? [closed]

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Closed 8 years ago.
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java.lang.ClassNotFoundException: org.aspectj.weaver.tools.PointcutParser
I use aspect in my project, and when I run it, this exception throws.
But When I remove my aspects, this issue disappears.
Can anyone help with this issue?
Thanks!!!
You need aspectjtools to your classpath
http://www.findjar.com/class/org/aspectj/weaver/tools/PointcutParser
http://mvnrepository.com/artifact/org.aspectj/aspectjtools
It would be quite easy to add it as maven-dependency with compile-scope

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