Create external datagroup fails

Hi,

LB version - v12.1.3.4

I cannot import ext datagroup to LB.

File content:

[root@testLB:Active:Not All Devices Synced] config  cat /var/tmp/extDatagroupTest2
"name1":="value1",
"name2":="value2",
"name3":="value3",

Error I get when creating datagroup to LTM:

root@(testLB)(cfg-sync Not All Devices Synced)(Active)(/Common)(tmos) create ltm data-group external testExtData source-path /var/tmp/extDatagroupTest2 type string
Copying file "/var/tmp/extDatagroupTest2" ...

curl: (3)  malformed

Unexpected Error: Failed! exit_code (3).

The file was created on LB itself, so there should not be any issues with win style ending lines.. Do you know what might cause such error? I cannot find much documentation to external datagroups..

Thanks, Zdenek