AdjacencyFromEdgelist: no visible global function definition for 'is'
EdgelistFill: no visible global function definition for 'is'
EdgelistFromIgraph: no visible global function definition for
  'get.adjacency'
EdgelistFromIgraph: no visible global function definition for 'V'
EdgelistFromIgraph: no visible global function definition for 'vcount'
GetSampleFromFile: no visible global function definition for
  'read.delim'
IgraphFromEdgelist: no visible global function definition for 'is'
IgraphFromEdgelist: no visible global function definition for
  'graph.adjacency'
IgraphFromEdgelist: no visible global function definition for 'V'
IgraphFromEdgelist: no visible global function definition for 'V<-'
MeasureNetworkInformation: no visible binding for global variable
  'betweenness'
MeasureNetworkInformation: no visible global function definition for
  'vcount'
MeasureNetworkInformation : SampleIgraph: no visible global function
  definition for 'ecount'
MeasureNetworkInformation : SampleIgraph: no visible global function
  definition for 'delete.edges'
MeasureNetworkInformation : SampleIgraph: no visible global function
  definition for 'E'
MeasureNetworkInformation: no visible global function definition for
  'txtProgressBar'
MeasureNetworkInformation: no visible global function definition for
  'setTxtProgressBar'
MergeEdgelists: no visible global function definition for 'is'
RelationStrengthSimilarity: no visible global function definition for
  'is'
RelationStrengthSimilarity: no visible global function definition for
  'txtProgressBar'
RelationStrengthSimilarity: no visible global function definition for
  'setTxtProgressBar'
RelativeNetworkInformation: no visible binding for global variable
  'betweenness'
RssSuggestedNetwork: no visible global function definition for 'is'
RssSuggestedNetwork: no visible global function definition for
  'get.adjacency'
RssSuggestedNetwork: no visible global function definition for
  'is.directed'
RssSuggestedNetwork: no visible global function definition for 'vcount'
RssSuggestedNetwork: no visible global function definition for
  'graph.adjacency'
RssSuggestedNetwork: no visible global function definition for
  'graph.density'
ScalablePCA: no visible global function definition for 'txtProgressBar'
ScalablePCA: no visible global function definition for 'prcomp'
ScalablePCA: no visible binding for global variable 'sd'
ScalablePCA: no visible global function definition for
  'setTxtProgressBar'
Undefined global functions or variables:
  E V V<- betweenness delete.edges ecount get.adjacency graph.adjacency
  graph.density is is.directed prcomp read.delim sd setTxtProgressBar
  txtProgressBar vcount
Consider adding
  importFrom("methods", "is")
  importFrom("stats", "prcomp", "sd")
  importFrom("utils", "read.delim", "setTxtProgressBar",
             "txtProgressBar")
to your NAMESPACE file (and ensure that your DESCRIPTION Imports field
contains 'methods').