r - Google Analytics query for sessions -

i trying analyze visits purchase in google analytics through r.

here code

query.list<-init(start.date = "2016-07-01",              end.date = "2016-08-01",              dimensions = c("ga:daystotransaction","ga:sessionstotransaction"),              metrics = c("ga:transaction"),              sort = c("ga:date"),              table.id = "ga:104454195") 

i have code shows error error in parsedatafeedjson(ga.data) : code : 400 reason : sort key ga:date not dimension or metric in query.

can me desired output

days transaction transaction %total
0 44 50%
1 11 20%
2-5 22 30%

you trying sort results based on dimension, not included in result set. have ga:daystotransaction , ga:sessionstotransactions dimensions, , have tried apply sort based on ga:date.

you'll need use sorting:

sort = c("ga:daystotransaction") 

it not clear me, if you'll use ga:sessionstotransactions in other part of script, it'll add other breakdown compared desired output, needs aggregated later expected results.

also, calculate %total in other part of script, or expect returned part of analytics response? (about i'm not sure, if it's possible in ga api or not.)