So you wake up in the morning, feeling inspired to take on a new challenge of coding. You remembered you cloned a repo you found interesting a while back, and now you're ready to open the project to study the code base and apply your knowledge to it. On opening the project, you see the error below.
Error: Unfortunately you can't have non-Gradle Java modules and > Android-Gradle modules in one project
Android studio had other plans for you. You've not even touched the code, and all you see is red lines with the message above popping up in your IDE. You ask the question "did the code get stale because I had not touched it in a while?".
Worry no more because I've got a solution for you.
Step 1
click on
File > Invalidate Caches/Restart > Invalidate
Step 2
click on
File > Close Project
Step 3
Go to the Project folder and delete the .idea folder.
Step 4
Delete YourProjectName.iml file in the Project folder.
Step 5
Open Android studio > open existing project, and then select your project.
If the error still occurs,
Step 6
click on
Build > Rebuild Project
You're all set. If the error persists, visit this link to try out other solutions.
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