Beta_dis: no visible global function definition for 'integrate'
Cauchy: no visible global function definition for 'integrate'
Chi_Square: no visible global function definition for 'integrate'
DynCon: no visible global function definition for 'dev.hold'
DynCon: no visible global function definition for 'par'
DynCon: no visible global function definition for 'plot'
DynCon: no visible global function definition for 'grid'
DynCon: no visible global function definition for 'polygon'
DynCon: no visible global function definition for 'legend'
DynCon: no visible global function definition for 'title'
DynCon: no visible global function definition for 'dev.interactive'
DynCon: no visible global function definition for 'dev.flush'
DynDis: no visible global function definition for 'dev.hold'
DynDis: no visible global function definition for 'par'
DynDis: no visible global function definition for 'plot'
DynDis: no visible global function definition for 'grid'
DynDis: no visible global function definition for 'points'
DynDis: no visible global function definition for 'legend'
DynDis: no visible global function definition for 'segments'
DynDis: no visible global function definition for 'title'
DynDis: no visible global function definition for 'dev.interactive'
DynDis: no visible global function definition for 'dev.flush'
Exponential: no visible global function definition for 'integrate'
F_dis: no visible global function definition for 'integrate'
Gamma_dis: no visible global function definition for 'pgamma'
Inverse_Gaussian: no visible global function definition for 'integrate'
Laplace: no visible global function definition for 'integrate'
Lognormal: no visible global function definition for 'integrate'
Normal: no visible global function definition for 'pnorm'
Pareto: no visible global function definition for 'integrate'
Rayleigh: no visible global function definition for 'integrate'
Student_t: no visible global function definition for 'integrate'
Undefined global functions or variables:
  dev.flush dev.hold dev.interactive grid integrate legend par pgamma
  plot pnorm points polygon segments title
Consider adding
  importFrom("grDevices", "dev.flush", "dev.hold", "dev.interactive")
  importFrom("graphics", "grid", "legend", "par", "plot", "points",
             "polygon", "segments", "title")
  importFrom("stats", "integrate", "pgamma", "pnorm")
to your NAMESPACE file.