---Error:!incallrsubprocess.Causedbyerrorin`1+"A"`:!non-numericargumenttobinaryoperatorBacktrace:1.callr::r(function()1+"A")2.callr:::get_result(output=out,options)ateval.R:193:33.callr:::throw(callr_remote_error(remerr,output),parent=fix_msg(remerr[[3]]))atresult.R:87:5Subprocessbacktrace:1.base::.handleSimpleError(function(e)2.globalh(simpleError(msg,call))