FTP Server issues with RTX

I am using RTX along with RL-TCPnet Library ported on LPC2387 microcontroller. I am facing an issue while running the FTP server along side RTX which is described as follows:

I have called init_TcpNetafter starting RTX in init_task and I am calling the main_TcpNet in another task which is scheduled after 10ms. I have enbled FTP server in NetConfig.c and included FTP_uif.c in my project. Now when I try to connect to the server through a FTP client running on Local computer, I find that ftp_ffind function gets called, but with incorrect parameter values and these values are essentially shifted i.e. code has the address of Buf, Buf has the value of Mask and so on.

I have also observed these values as a reference from FTP_demo.UV2 project which is demo project provided by keil and does not use RTX and I found that these values were correct and I was able to connect to the FTP server with my client.

Kindly let me know if there are any known issues of running FTP Server with RTX, and if so, then let me know the steps to solve this issue.