Kotlin complains about API version not supported - maven

Question

I'm relatively new to Kotlin.
I did create a test project, just the Hello World for now.
Compile/Package OK, then when I try to run the main.kt :
Kotlin: API version 1.1 is no longer supported; please, use version 1.2 or greater.
Is driving me nuts.
Ok, here some info and things I did :
Ubuntu 18.04
IntelliJ Idea Ultimate 2020.3 - all plugins/libraries updated
Kotlin project created from Project --> Kotlin --> Console Application --> SDK 1.8 --> Maven (need to simulate another environment that has similar settings)
On Settings/Build/Kotlin Compiler I selected Language version 1.4
When building I have only some warnings and I did notice this one :
[WARNING] Runtime JAR files in the classpath should have the same version. These files were found in the classpath:
/home/steve/.m2/repository/org/jetbrains/kotlin/kotlin-stdlib/1.1.1/kotlin-stdlib-1.1.1.jar (version 1.1)
/home/steve/.m2/repository/org/jetbrains/kotlin/kotlin-stdlib-jdk8/1.4.31/kotlin-stdlib-jdk8-1.4.31.jar (version 1.4)
/home/steve/.m2/repository/org/jetbrains/kotlin/kotlin-stdlib-jdk7/1.4.31/kotlin-stdlib-jdk7-1.4.31.jar (version 1.4)
So it seems is still importing a stdlib 1.1.1, I did try to remove manually it but without success, is always there.
The POM only has this from jetbrains :
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-stdlib-jdk8</artifactId>
<version>1.4.31</version>
</dependency>
Can anybody please give me some suggestions about how to fix this kind of problem ?
Thanks
STeve
Ok, I did restart from scratch many times trying to identify the problem and I think I did it, i.e. I identified the problem but I don't have a solution.
Starting from scratch everything is working, however I need to add to the project some classes I created in other projects in order to test them.
One of the class imported uses a library called khttp.
Well the moment I add this library as dependence in the project, even without adding any code that use it, screw up everything and I end up with the error :
Kotlin: API version 1.0 is no longer supported; please, use version 1.3 or greater.
The ONLY way I found so far to solve the problem is to remove from the POM the dependency of the library.
So I guess that the problem is IN the library.
If I can't find a solution I guess I need to don't use khttp.
Thanks

Answer 1

Go to
Intellij Preferences -> Build, Execution, Deployment -> Compiler -> Kotlin Compiler. Update Language version
and Api version to the one you wish.
**Click run again it should work fine.

Answer 2

for me it worked like this: right click on project and go to
project settings -> modules -> Kotlin
there I set the API Version to 1.5

Answer 3

I update the Kotlin dependencies version in pom.xml from 1.3.61 to 1.5.10 and it's ok for me

Answer 4

Project Structure>Modules>General
When you go there you gonna see 2 sections right side. Language version and API version. Update these 1.5 and problem will solve easily.