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Hello,
There could be the reason that EMR_EC2_DefaultRole might have been modified or deleted which would not allow to create the EMR cluster through Studio. To solve it, you need to create "EMR_EC2_DefaultRole" role by following the guidelines in this AWS documentation.
Below are the steps to achieve this result:
1- In AWS IAM console, under "Roles", click on "Create role" button.
2- Under "Use cases for other AWS services", choose "EMR" and select EMR Role for EC2 then click on next.
3- The "AmazonElasticMapReduceforEC2Role" policy will be automatically attached to your role. Click on next.
4- Under "Role name", enter "EMR_EC2_DefaultRole" and click on "Create role".
What helped in my case was calling aws emr create-default-roles
from the command line. This will create the three roles "EMR_DefaultRole", "EMR_EC2_DefaultRole" and "EMR_AutoScaling_DefaultRole" in your AWS environment.
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