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Regressiontest RingCyclotronMatched is failing with OPAL-1.5.x

OPAL{0}> *** User error detected by function "ClosedOrbitFinder::findOrbit()"
OPAL{0}> *** in line 84 of file "RingCyclotronMatched.in" at end of statement:
OPAL{0}>     RUN,METHOD="CYCLOTRON-T",BEAM=BEAM1,FIELDSOLVER=FS1,DISTRIBUTION=DIST1;
OPAL{0}>     p_{r}^2 > p^{2} (defined in Gordon paper) --> Square root of negative number.