error when use "normalRelativeAngleDegrees(double angle)"

[email protected] Wed, 1 Aug 2018 12:32:38 -0700 (PDT)
Newsgroups gmane.comp.java.robocode
Message-ID <[email protected]>
When I try to use "normalRelativeAngleDegrees(double angle)" I get an error 
saying 
source level must be 1.5 or greater. So, how do I get this higher level of 
code?

regards,
andrew

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