build_ccit : <anonymous>: no visible global function definition for
  ‘as.formula’
ccif.formula: no visible global function definition for ‘terms’
ccif.formula: no visible global function definition for
  ‘model.response’
ccif.formula: no visible global function definition for ‘model.frame’
ccif.formula: no visible global function definition for ‘reformulate’
explore: no visible binding for global variable ‘na.pass’
explore: no visible global function definition for ‘terms’
explore: no visible global function definition for ‘model.response’
explore: no visible global function definition for ‘model.frame’
explore: no visible global function definition for ‘reformulate’
explore: no visible global function definition for ‘quantile’
modelProfile: no visible binding for global variable ‘na.pass’
modelProfile: no visible global function definition for
  ‘model.response’
modelProfile: no visible global function definition for ‘quantile’
niv: no visible binding for global variable ‘na.pass’
niv: no visible global function definition for ‘terms’
niv: no visible global function definition for ‘model.response’
niv: no visible global function definition for ‘model.frame’
niv: no visible global function definition for ‘reformulate’
niv: no visible global function definition for ‘quantile’
niv: no visible binding for global variable ‘sd’
niv: no visible global function definition for ‘barplot’
performance: no visible global function definition for ‘quantile’
predict.ccif: no visible global function definition for ‘model.frame’
predict.ccif: no visible global function definition for ‘terms’
predict.ccif: no visible global function definition for ‘reformulate’
predict.ccif: no visible binding for global variable ‘na.pass’
predict.upliftRF: no visible global function definition for
  ‘model.frame’
predict.upliftRF: no visible global function definition for ‘terms’
predict.upliftRF: no visible global function definition for
  ‘reformulate’
predict.upliftRF: no visible binding for global variable ‘na.pass’
qini.performance: no visible global function definition for ‘plot’
qini.performance: no visible global function definition for ‘lines’
qini.performance: no visible global function definition for ‘legend’
rvtu: no visible binding for global variable ‘na.pass’
rvtu: no visible global function definition for ‘terms’
rvtu: no visible global function definition for ‘model.response’
rvtu: no visible global function definition for ‘model.frame’
rvtu: no visible global function definition for ‘reformulate’
sim_pte: no visible global function definition for ‘rnorm’
sim_pte: no visible global function definition for ‘runif’
sim_pte: no visible global function definition for ‘pnorm’
tian_transf: no visible binding for global variable ‘na.pass’
tian_transf: no visible global function definition for ‘terms’
tian_transf: no visible global function definition for ‘model.response’
tian_transf: no visible global function definition for ‘model.matrix’
tian_transf: no visible global function definition for ‘reformulate’
tian_transf: no visible binding for global variable ‘contrasts’
upliftKNN: no visible global function definition for ‘dist’
upliftRF.formula: no visible global function definition for ‘terms’
upliftRF.formula: no visible global function definition for
  ‘model.response’
upliftRF.formula: no visible global function definition for
  ‘model.frame’
upliftRF.formula: no visible global function definition for
  ‘reformulate’
varImportance.ccif: no visible global function definition for ‘barplot’
varImportance.upliftRF: no visible global function definition for
  ‘barplot’
Undefined global functions or variables:
  as.formula barplot contrasts dist legend lines model.frame
  model.matrix model.response na.pass plot pnorm quantile reformulate
  rnorm runif sd terms
Consider adding
  importFrom("graphics", "barplot", "legend", "lines", "plot")
  importFrom("stats", "as.formula", "contrasts", "dist", "model.frame",
             "model.matrix", "model.response", "na.pass", "pnorm",
             "quantile", "reformulate", "rnorm", "runif", "sd", "terms")
to your NAMESPACE file.