[.grplasso: no visible global function definition for 'coef'
[.grplasso: no visible global function definition for 'fitted'
create.design: no visible global function definition for 'as.formula'
create.design: no visible global function definition for 'model.matrix'
create.design: no visible global function definition for
  'model.response'
create.design: no visible global function definition for
  'model.weights'
create.design: no visible global function definition for 'model.offset'
create.design: no visible global function definition for 'terms'
grplasso.formula: no visible global function definition for
  '.getXlevels'
lambdamax.default: no visible binding for global variable 'nlminb'
plot.grplasso: no visible global function definition for 'na.omit'
plot.grplasso: no visible global function definition for 'matplot'
plot.grplasso: no visible global function definition for 'coef'
plot.grplasso: no visible global function definition for 'axis'
predict.grplasso: no visible binding for global variable 'na.pass'
predict.grplasso: no visible global function definition for 'fitted'
predict.grplasso: no visible global function definition for 'napredict'
predict.grplasso: no visible global function definition for
  'delete.response'
predict.grplasso: no visible global function definition for
  'model.frame'
predict.grplasso: no visible global function definition for
  '.checkMFClasses'
predict.grplasso: no visible global function definition for
  'model.matrix'
predict.grplasso: no visible global function definition for 'coef'
print.grplasso: no visible global function definition for 'na.omit'
Undefined global functions or variables:
  .checkMFClasses .getXlevels as.formula axis coef delete.response
  fitted matplot model.frame model.matrix model.offset model.response
  model.weights na.omit na.pass napredict nlminb terms
Consider adding
  importFrom("graphics", "axis", "matplot")
  importFrom("stats", ".checkMFClasses", ".getXlevels", "as.formula",
             "coef", "delete.response", "fitted", "model.frame",
             "model.matrix", "model.offset", "model.response",
             "model.weights", "na.omit", "na.pass", "napredict",
             "nlminb", "terms")
to your NAMESPACE file.