Errors building package

[SamoPP]

When trying to build SIT package locally I got following errors:

• installing to library ‘/usr/local/lib/R/site-library’
• installing source package ‘SIT’ ...
  ** R
  Error in .install_package_code_files(".", instdir) :
  files in 'Collate' field missing from '/home/myusername/git/systematicinvestor/SIT/pkg/R':
  cluster.r
  interactive.r
  rfinance2013.r
  rfinance2014.r
  zzz.r
  ERROR: unable to collate and parse R files for package ‘SIT’
• removing ‘/usr/local/lib/R/site-library/SIT’

[SamoPP]

If I remove Collate section from DESCRIPTION the following errors appear:

• installing to library ‘/usr/local/lib/R/site-library’
• installing source package ‘SIT’ ...
  ** R
  ** byte-compile and prepare package for lazy loading
  Warning in grepl("\n", lines, fixed = TRUE) :
  input string 16678 is invalid in this locale
  Warning in grepl("\n", lines, fixed = TRUE) :
  input string 17894 is invalid in this locale
  Warning in grepl("\n", lines, fixed = TRUE) :
  input string 24425 is invalid in this locale
  Warning in grepl("\n", lines, fixed = TRUE) :
  input string 28185 is invalid in this locale
  Warning in grepl("\n", lines, fixed = TRUE) :
  input string 30230 is invalid in this locale
  Note: possible error in 'create.historical.ia(hist.returns, ':
  unused arguments (symbols, symbol.names)
  Note: possible error in 'create.historical.ia(hist.returns, ':
  unused arguments (symbol.names, symbol.names)
  Note: possible error in 'create.historical.ia(hist.returns, ':
  unused arguments (symbol.names, symbol.names)
  Note: possible error in 'create.historical.ia(hist.returns, ':
  unused argument (symbols)
  Note: no visible binding for '<<-' assignment to 'gall'
  Note: no visible binding for '<<-' assignment to 'gia'
  ** help
  *** installing help indices
  ** building package indices
  ** testing if installed package can be loaded
  ERROR: loading failed
  Error in namespaceExport(ns, exports) :
  undefined exports: bt.make.cashflow.event.summary.table, bt.make.trade.event.summary.table, bt.run.share.ex, bt.run.share.ex.allocate, bt.run.share.ex.invest, bt.run.share.ex.test, bt.run.share.ex.test.cashflow, bt.run.share.ex.test.tax, bt.run.share.fast, bt.run.share.unadjusted.test, bt.run.share.unadjusted.test.data, bt.unadjusted.add.div.split, default.round.lot.control, default.tax.control, event.at, iline, look.at.taxes, round.lot, round.lot.basic, round.lot.basic.base, round.to, setup.cluster, tax.cashflows, tax.summary, visualize.system.parameter.optimization
  Error: loading failed
  Execution halted
• removing ‘/usr/local/lib/R/site-library/SIT’