So, we figured it out. If you delete everything until the [Data] tag in the sample sheet, leaving the [Data] tag, it starts working. Here is the full sample_sheet.csv that is working:
[Data]
Lane,Sample_ID,Sample_Name,index,Sample_Project
1,SI-GA-B4_1,17R,ACTTCATA,Chromium_20180409
1,SI-GA-B4_2,17R,GAGATGAC,Chromium_20180409
1,SI-GA-B4_3,17R,TGCCGTGG,Chromium_20180409
1,SI-GA-B4_4,17R,CTAGACCT,Chromium_20180409
1,SI-GA-B5_1,19RL,AATAATGG,Chromium_20180409
1,SI-GA-B5_2,19RL,CCAGGGCA,Chromium_20180409
1,SI-GA-B5_3,19RL,TGCCTCAT,Chromium_20180409
1,SI-GA-B5_4,19RL,GTGTCATC,Chromium_20180409
2,SI-GA-B4_1,17R,ACTTCATA,Chromium_20180409
2,SI-GA-B4_2,17R,GAGATGAC,Chromium_20180409
2,SI-GA-B4_3,17R,TGCCGTGG,Chromium_20180409
2,SI-GA-B4_4,17R,CTAGACCT,Chromium_20180409
2,SI-GA-B5_1,19RL,AATAATGG,Chromium_20180409
2,SI-GA-B5_2,19RL,CCAGGGCA,Chromium_20180409
2,SI-GA-B5_3,19RL,TGCCTCAT,Chromium_20180409
2,SI-GA-B5_4,19RL,GTGTCATC,Chromium_20180409
3,SI-GA-B4_1,17R,ACTTCATA,Chromium_20180409
3,SI-GA-B4_2,17R,GAGATGAC,Chromium_20180409
3,SI-GA-B4_3,17R,TGCCGTGG,Chromium_20180409
3,SI-GA-B4_4,17R,CTAGACCT,Chromium_20180409
3,SI-GA-B5_1,19RL,AATAATGG,Chromium_20180409
3,SI-GA-B5_2,19RL,CCAGGGCA,Chromium_20180409
3,SI-GA-B5_3,19RL,TGCCTCAT,Chromium_20180409
3,SI-GA-B5_4,19RL,GTGTCATC,Chromium_20180409
4,SI-GA-B4_1,17R,ACTTCATA,Chromium_20180409
4,SI-GA-B4_2,17R,GAGATGAC,Chromium_20180409
4,SI-GA-B4_3,17R,TGCCGTGG,Chromium_20180409
4,SI-GA-B4_4,17R,CTAGACCT,Chromium_20180409
4,SI-GA-B5_1,19RL,AATAATGG,Chromium_20180409
4,SI-GA-B5_2,19RL,CCAGGGCA,Chromium_20180409
4,SI-GA-B5_3,19RL,TGCCTCAT,Chromium_20180409
4,SI-GA-B5_4,19RL,GTGTCATC,Chromium_20180409
It is very unfortunate and disappointing that 10X website is generating wrong sample sheet.