How to resolve the Error "OS_ERROR_TIMER_OVF" in RTX -

i 'm got started coding rtos program using rtx. , encountered error "os_error_timer_ovf" . according following program,it occurred "due user timer callback queue overflow detected". so, changed os_timercbqs value 4 25. error not disappeared.

void os_error (uint32_t error_code) { /* here: include optional code executed on runtime error. */ switch (error_code) { case os_error_stack_ovf:   /* stack overflow detected running task. */   /* thread can identified calling svcthreadgetid().   */          tid_overstack = svcthreadgetid();   break; case os_error_fifo_ovf:   /* isr fifo queue buffer overflow detected. */   break; case os_error_mbx_ovf:   /* mailbox overflow detected. */   break; case os_error_timer_ovf:   /* user timer callback queue overflow detected. */   break; default:   break; } (;;); } 

how should resolve error? if know solution ,please let me know.