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RL-TCPnet crash when send and get at the same time

Hello everyone,

I'm working on a web service with RL-ARM libraries that I want to send some parameters with AJAX as .cgx file and the same time I want to create socket and then send a lot of data to destination.

but the problem is when my Microcontroller  wants to do these two tasks at the same moment .It crashes .I discover with debug that the process stops at this function  main_TcpNet(); .

and I also realize the process doesn't stop in these function 

U16 cgi_func (U8 *env, U8 *buf, U16 buflen, U32 *pcgi){}

and 

void cgi_process_data (U8 code, U8 *dat, U16 len) {}

I'm beyond confuse because of I don't know what should I do to fix it .

the Microcontroller is : LPC1768

network IC is DP83848VV

Thank in advance.