Registration problems:
  symbol ‘`_quanteda_cacpp`’ not in namespace:
   .Call(`_quanteda_cacpp`, objm, threads, residual_floor)
  symbol ‘`_quanteda_qatd_CanberraPara_cpp`’ not in namespace:
   .Call(`_quanteda_qatd_CanberraPara_cpp`, A, margin)
  symbol ‘`_quanteda_qatd_CanberraPara_cpp2`’ not in namespace:
   .Call(`_quanteda_qatd_CanberraPara_cpp2`, A, B, margin)
  symbol ‘`_quanteda_qatd_ManhattanPara_cpp`’ not in namespace:
   .Call(`_quanteda_qatd_ManhattanPara_cpp`, A, margin)
  symbol ‘`_quanteda_qatd_ManhattanPara_cpp2`’ not in namespace:
   .Call(`_quanteda_qatd_ManhattanPara_cpp2`, A, B, margin)
  symbol ‘`_quanteda_qatd_MaximumPara_cpp`’ not in namespace:
   .Call(`_quanteda_qatd_MaximumPara_cpp`, A, margin)
  symbol ‘`_quanteda_qatd_MaximumPara_cpp2`’ not in namespace:
   .Call(`_quanteda_qatd_MaximumPara_cpp2`, A, B, margin)
  symbol ‘`_quanteda_qatd_MinkowskiPara_cpp`’ not in namespace:
   .Call(`_quanteda_qatd_MinkowskiPara_cpp`, A, margin, p)
  symbol ‘`_quanteda_qatd_MinkowskiPara_cpp2`’ not in namespace:
   .Call(`_quanteda_qatd_MinkowskiPara_cpp2`, A, B, margin, p)
  symbol ‘`_quanteda_qatd_cpp_chars_remove`’ not in namespace:
   .Call(`_quanteda_qatd_cpp_chars_remove`, input_, char_remove)
  symbol ‘`_quanteda_qatd_cpp_fcm`’ not in namespace:
   .Call(`_quanteda_qatd_cpp_fcm`, texts_, n_types, count, window, 
       weights, ordered, tri, nvec)
  symbol ‘`_quanteda_qatd_cpp_kwic`’ not in namespace:
   .Call(`_quanteda_qatd_cpp_kwic`, texts_, types_, words_, window, 
       join)
  symbol ‘`_quanteda_qatd_cpp_sequences`’ not in namespace:
   .Call(`_quanteda_qatd_cpp_sequences`, texts_, types_, count_min, 
       sizes_, method, smoothing)
  symbol ‘`_quanteda_qatd_cpp_tbb_enabled`’ not in namespace:
   .Call(`_quanteda_qatd_cpp_tbb_enabled`)
  symbol ‘`_quanteda_qatd_cpp_tokens_compound`’ not in namespace:
   .Call(`_quanteda_qatd_cpp_tokens_compound`, texts_, comps_, types_, 
       delim_, join)
  symbol ‘`_quanteda_qatd_cpp_tokens_detect`’ not in namespace:
   .Call(`_quanteda_qatd_cpp_tokens_detect`, texts_, words_)
  symbol ‘`_quanteda_qatd_cpp_tokens_lookup`’ not in namespace:
   .Call(`_quanteda_qatd_cpp_tokens_lookup`, texts_, types_, keys_, 
       ids_, overlap, nomatch)
  symbol ‘`_quanteda_qatd_cpp_tokens_match`’ not in namespace:
   .Call(`_quanteda_qatd_cpp_tokens_match`, texts_, types_, words_, 
       ids_, overlap)
  symbol ‘`_quanteda_qatd_cpp_tokens_ngrams`’ not in namespace:
   .Call(`_quanteda_qatd_cpp_tokens_ngrams`, texts_, types_, delim_, 
       ns_, skips_)
  symbol ‘`_quanteda_qatd_cpp_tokens_recompile`’ not in namespace:
   .Call(`_quanteda_qatd_cpp_tokens_recompile`, texts_, types_)
  symbol ‘`_quanteda_qatd_cpp_tokens_replace`’ not in namespace:
   .Call(`_quanteda_qatd_cpp_tokens_replace`, texts_, types_, words_, 
       ids_)
  symbol ‘`_quanteda_qatd_cpp_tokens_select`’ not in namespace:
   .Call(`_quanteda_qatd_cpp_tokens_select`, texts_, types_, words_, 
       mode, padding)
  symbol ‘`_quanteda_wordfishcpp`’ not in namespace:
   .Call(`_quanteda_wordfishcpp`, wfm, dirvec, priorvec, tolvec, 
       disptype, dispmin, ABS, svd_on, residual_floor)
  symbol ‘`_quanteda_wordfishcpp_dense`’ not in namespace:
   .Call(`_quanteda_wordfishcpp_dense`, wfm, dir, priors, tol, disp, 
       dispfloor, abs_err)
  symbol ‘`_quanteda_wordfishcpp_mt`’ not in namespace:
   .Call(`_quanteda_wordfishcpp_mt`, wfm, dirvec, priorvec, tolvec, 
       disptype, dispmin, ABS, svd_sparse, residual_floor)
See chapter ‘System and foreign language interfaces’ in the ‘Writing R
Extensions’ manual.