questasim test case failed

[mahalakshmir.ma]

hi,
 
I tried running interfaced GPIO with the test cases given in PULPino environment. after running testcases I am getting has test case  failed. why test failed occurs.

** Warning: NUMERIC_STD."=": metavalue detected, returning FALSE
#    Time: 0 ps  Iteration: 0  Instance: /tb/top_i/peripherals_i/apb_uart_i/UART_RXFF
# ** Warning: NUMERIC_STD."=": metavalue detected, returning FALSE
#    Time: 0 ps  Iteration: 0  Instance: /tb/top_i/peripherals_i/apb_uart_i/UART_TXFF
# Using MEMLOAD method: PRELOAD
# Using      ri5cy core
# [SPI] Enabling QPI mode
# [adv_dbg_if] AXI4 WRITE         32 burst @1a107008 for           4 bytes.
# Preloading memory
# Preloading instruction memory from slm_files/l2_stim.slm
# Preloading data memory from slm_files/tcdm_bank0.slm
# [TRACER] Output filename is: trace_core_00_0.log    
#[SPI] Received 00000003
#[SPI] Test  Failed
# **Note :$Stop   


THANKS IN ADVANCE