biplot.pcaridge : Arrows: no visible global function definition for
  ‘arrows’
biplot.pcaridge: no visible global function definition for ‘plot’
biplot.pcaridge: no visible global function definition for ‘par’
biplot.ridge: no visible global function definition for ‘coef’
contourf: no visible global function definition for ‘par’
contourf: no visible global function definition for ‘colorRampPalette’
contourf: no visible global function definition for ‘contour’
contourf: no visible global function definition for ‘contourLines’
contourf: no visible global function definition for ‘polygon’
pairs.ridge : panel.label: no visible global function definition for
  ‘par’
pairs.ridge : panel.label: no visible global function definition for
  ‘plot’
pairs.ridge : panel.label: no visible global function definition for
  ‘text’
pairs.ridge : panel.label: no visible global function definition for
  ‘box’
pairs.ridge : panel.barplot: no visible global function definition for
  ‘barplot’
pairs.ridge : panel.barplot: no visible global function definition for
  ‘box’
pairs.ridge: no visible global function definition for ‘par’
pairs.ridge: no visible global function definition for ‘box’
plot.pcaridge: no visible global function definition for ‘coef’
plot.ridge: no visible global function definition for ‘gray’
plot.ridge: no visible global function definition for ‘plot’
plot.ridge: no visible global function definition for ‘abline’
plot.ridge: no visible global function definition for ‘polygon’
plot.ridge: no visible global function definition for ‘text’
plot3d.pcaridge: no visible global function definition for ‘coef’
plot3d.ridge: no visible global function definition for ‘gray’
precision.lm: no visible global function definition for ‘vcov’
precision.lm: no visible global function definition for ‘coefficients’
precision.ridge: no visible global function definition for ‘coef’
print.ridge: no visible global function definition for ‘coef’
ridge.default: no visible global function definition for ‘lm.fit’
ridge.default : <anonymous>: no visible global function definition for
  ‘uniroot’
ridge.formula: no visible global function definition for
  ‘model.response’
ridge.formula: no visible global function definition for ‘model.matrix’
ridge.formula: no visible binding for global variable ‘contrasts’
ridge.formula: no visible global function definition for ‘model.offset’
traceplot: no visible global function definition for ‘matplot’
traceplot: no visible global function definition for ‘abline’
traceplot: no visible global function definition for ‘text’
trans.colors: no visible global function definition for ‘col2rgb’
trans.colors: no visible global function definition for ‘rgb’
vif.ridge : Vif: no visible global function definition for ‘cov2cor’
vif.ridge: no visible global function definition for ‘vcov’
vif.ridge: no visible global function definition for ‘coef’
Undefined global functions or variables:
  abline arrows barplot box coef coefficients col2rgb colorRampPalette
  contour contourLines contrasts cov2cor gray lm.fit matplot
  model.matrix model.offset model.response par plot polygon rgb text
  uniroot vcov
Consider adding
  importFrom("grDevices", "col2rgb", "colorRampPalette", "contourLines",
             "gray", "rgb")
  importFrom("graphics", "abline", "arrows", "barplot", "box", "contour",
             "matplot", "par", "plot", "polygon", "text")
  importFrom("stats", "coef", "coefficients", "contrasts", "cov2cor",
             "lm.fit", "model.matrix", "model.offset", "model.response",
             "uniroot", "vcov")
to your NAMESPACE file.