message: remove extra , in solver config mode.
diff: @@ -242,7 +242,7 @@ void AmgXSolver::DefaultParameters(const AMGX_MODE amgxMode_,
  " \"solver\": \"AMG\", \n"
  " \"smoother\": { \n"
  " \"scope\": \"jacobi\", \n"
  - " \"solver\": \"JACOBI_L1\", \n"
  + " \"solver\": \"JACOBI_L1\" \n"
  " }, \n"
  " \"presweeps\": 1, \n"
  " \"interpolator\": \"D2\", \n"
  