197 [main] ERROR org.testng.TestNG -
Cannot find class in classpath: org.testng.dataprovider.DynamicDataProviderLoadingTest

The error occurs because we had to delete that class as is also described in the src_test() phase.

# import org.netbeans.lib.profiler.heap.HeapFactory2 # error: unresolved reference 'HeapFactory2'
# Tried with 'org-netbeans-lib-profiler-2.2.0.jar' which contains 'HeapFactory' but not 'HeapFactory2'.
rm testng-core/src/test/kotlin/org/testng/dataprovider/DynamicDataProviderLoadingTest.kt || die
# With a patch we also remove it from testng-core/src/test/resources/testng.xml

# Removing the above file leads to:
# import org.testng.dataprovider.DynamicDataProviderLoadingTest
# error: unresolved reference 'DynamicDataProviderLoadingTest'.
rm testng-core/src/test/kotlin/org/testng/dataprovider/sample/issue2724/SampleDPUnloaded.kt || die

--- a/testng-core/src/test/resources/testng.xml
+++ b/testng-core/src/test/resources/testng.xml
@@ -971,7 +971,6 @@
   <test name="Kotlin">
     <classes>
       <class name="org.testng.BasicTest"/>
-      <class name="org.testng.dataprovider.DynamicDataProviderLoadingTest" />
     </classes>
   </test>
 </suite>