Invalid preamble issue whenever trying to process data

[Imtiaz08]

Hi there, I have been trying to process a signal that I have created using GPS-SDR-SIM.

the signal has 0 Hz IF because it is a baseband signal in the .bin file. Similarly, the sampling frequency is 2.5e6 and the total duration of the signal is 300 seconds.

Apart from that, I have another signal that I caught with RTL-SDR and it has a sampling frequency of 2.048 MHz. However, when I was trying to process these signals, I noticed that no satellites were being acquired during the acquisition phase. So I reduce the Det. Acquisition from 2.5 to 1.5 and after that Selected the sampling frequency to 2.048 and IF to 0.

When I run the code again I can acquire all the PRNs available in the channels. However, when it comes to tracking it says invalid preamble. Can you help me what could be the reason behind this error?

Here are the screenshots of the settings and results