Error when importing a JUnit report with huge amount of Test Cases

Error when importing a JUnit report with huge amount of Test Cases.

With a JUnit report in the range of three hundred Test Cases (that don't exist yet) it returns the error below:

{"error":"Server Error - Error retrieving Project from Jira with key \".......\": "}

How to reproduce:

1. Make a REST API call using the Test Execution Key (an existing one) but where the Tests are not created yet.
2. Use a JUnit report that has a lot of Test Cases like 350 or more.