I tried this to convert transcript ids from salmon to gene ids

 library(EnsDb.Hsapiens.v86)
 library(dplyr)
 salmon_output = read.delim("quant.sf")
 tx2gene = transcripts(EnsDb.Hsapiens.v86,  columns=c("tx_id", "gene_name", "gene_id"), return.type="DataFrame")
  gene_tpms <- salmon_output %>%
  inner_join(tx2gene, by=c("Name"="tx_id")) %>%
  group_by(gene_id, gene_name) %>%
  summerise(TPM=sum(TPM))

This always generates the error

   Error in UseMethod("tbl_vars") :  no applicable method for 'tbl_vars' applied to an object of class "c('DataFrame', DataTable', 'SimpleList', 'DataTable_OR_NULL', 'List', 'Vector', 'list_OR_List', 'Annotated')"

I understand that it has got something to do with the structure of the data but unable to fix it