I am trying to get the random value from list of data. But I am geting the error(-17994).
web_reg_save_param("c_Log",
"LB=LogNumber:",
"RB=\"",
"Ordinal=All",LAST);
lr_save_string(lr_paramarr_random("c_Log"),"randomValue");
If this is the precise ordering in your code then your pseudo array is unlikely to have any values in it until the next page/HTTP request is made. You would be attempting a random assignment of an empty set.
Try setting your lr_save_string() after the next page load when the c_log array is likely to have some values seeded, assuming the expected page loads correctly
web_reg_save_param(...);
web_url(...);
lr_save_string(...);