ICS_root : getfirst: no visible global function definition for
  'na.omit'
buildBasket: no visible global function definition for 'start'
buildBasket: no visible global function definition for 'end'
buildSpread: no visible global function definition for 'start'
buildSpread: no visible global function definition for 'end'
build_spread_symbols: no visible global function definition for
  'read.csv'
build_spread_symbols: no visible global function definition for
  'write.csv'
convert.time.series: no visible global function definition for 'as.ts'
currency: no visible global function definition for 'hasArg'
expires.xts: no visible global function definition for 'end'
expires.xts: no visible global function definition for 'na.omit'
fn_SpreadBuilder : fn_split: no visible global function definition for
  'na.omit'
fn_SpreadBuilder: no visible global function definition for 'na.omit'
getSymbols.FI: no visible global function definition for 'hasArg'
instrument: no visible global function definition for 'hasArg'
instrument: no visible global function definition for 'tail'
load.instruments: no visible global function definition for 'read.csv'
loadInstruments: no visible global function definition for 'tail'
print.id.list: no visible global function definition for 'str'
print.instrument: no visible global function definition for 'str'
print.suffix.list: no visible global function definition for 'str'
redenominate: no visible global function definition for 'na.omit'
saveInstruments: no visible global function definition for 'tail'
update_instruments.SPDR: no visible global function definition for
  'download.file'
update_instruments.SPDR: no visible global function definition for
  'read.csv'
update_instruments.iShares: no visible global function definition for
  'download.file'
update_instruments.iShares: no visible global function definition for
  'read.csv'
update_instruments.iShares: no visible global function definition for
  'read.delim'
update_instruments.masterDATA: no visible global function definition
  for 'read.csv'
update_instruments.md: no visible global function definition for
  'read.csv'
update_instruments.yahoo: no visible global function definition for
  'hasArg'
update_instruments.yahoo: no visible global function definition for
  'na.omit'
Undefined global functions or variables:
  as.ts download.file end hasArg na.omit read.csv read.delim start str
  tail write.csv
Consider adding
  importFrom("methods", "hasArg")
  importFrom("stats", "as.ts", "end", "na.omit", "start")
  importFrom("utils", "download.file", "read.csv", "read.delim", "str",
             "tail", "write.csv")
to your NAMESPACE file (and ensure that your DESCRIPTION Imports field
contains 'methods').