Generate and acquire data with marker (HSDIO)

HI. I use PXIe-6556. What i do:

1). Export Onboard clock to DDC CLK OUT. I connected physically PFI4 to PFI3.

2). Then I use script to generate data. In script I use marker (PFI2).

3). And I want acquire data when marker appears. But instead this i have mistake:

niHSDIO Fetch Multi Record (WDT).vi<ERR>Driver Status: (Hex 0xBFFA4020) Some or all of the samples requested have not yet been acquired. To wait for the samples to become available, use a longer read timeout or read later in your program. If your session uses a trigger, make sure that your trigger is configured correctly.

Status Code: -200284

Please help what i do wrong?