Calculation failed

INPUT FOR ISOTROPIC DIELECTRICS
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EPS= 78.39
INPUT FOR CAVITY DEFINITION
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ATOM COORDINATES RADIUS EPS
1 15.4707 -10.2287 -0.4924 0.0000 78.3900
2 -16.0167 11.8932 -3.3157 0.0000 78.3900
**** ERROR **** PCM SPHERE(S) MUST HAVE A POSITIVE RADIUS
EXECUTION OF GAMESS TERMINATED -ABNORMALLY- AT Fri Jul 10 08:17:21 2020