How to solve
This is one of the common issue people face when running testng suites.
Most common reason is conflicting of testng versions. May be there are 2 versions of testng in your classpath , which are causing this issue.
Check your maven dependency from Build path
[Right click on project-->Build Path -->Configure build path --> Maven dependency and check for testng]
if there are 2 version of testng, delete one.
This should solve your problem.
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