Expect script does not work under crontab

I have an expect script which I need to run every 3 mins on my management node to collect tx/rx values for each port attached to DCX Brocade SAN Switch using the command #portperfshow# Each time I try to use crontab to execute the script every 3 mins, the script does not work! My expect script starts with #!/usr/bin/expect -f and I am calling the script using the following syntax under cron: 3 * *

[k_enoki]

はまったしめも

[kk_Ataka]

Expectむずい。