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Spectran V6 Tx input underflow warning when using HTTP Server block to feed IQ data stream

I have a Spectran V6 VSG 240XA-6. I want to stream raw IQ data from Gnuradio and transmit the same via Spectran V6 VSG.

I came across a GNU Radio integration for the Rx part which interacts with the HTTP block in RTSA software.  So I tried to test the same for the Tx part as well, but facing some issue with it.
To test I connected IQ signal generator with the Spectran V6 block and it works, but when I connect HTTP Server and client block in between the IQ Signal generator and Spectran V6 block,  it shows Tx input underflow warning.
Following flowgraph works and I am getting the RF output on Tx port.
Following flowgraph gives Tx Input underflow warning and not getting any RF output on the Tx port.
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I even used example from
https://v6-forum.aaronia.de/forum/topic/c-send-iq-data-to-the-rtsa-suite/#postid-4096

I added the Spectran V6 block to the mission provided here also I am getting the same warning message.

here is the mission file of this:

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