Blocking Writes while creating non clustered index

Hi,I am trying to create a non clustered index with ONLINE on a table(say tableA), I am having a huge chain of blockings on this table for write queries. below are the set options I am using [code="WITH ( ONLINE = ON , DATA_COMPRESSION = PAGE , STATISTICS_NORECOMPUTE = ON , SORT_IN_TEMPDB = ON , FILLFACTOR = 90 )"][/code]