ERROR MESSAGE:- TypeError: Cannot call method "getFieldValue" of undefined what exactly does this mean wether the value is not or im trying to access a field that doesnot exists?

What does your code look like?

o_mnth_end_effrt_prev_mnth.getFieldValue('custrecord_json_mnth_end_effrt');

What is the type of o_mnth_end_effrt_prev_mnth? Is it record?

before o_mnth_end_effrt_prev_mnth this is case of error, clear your record object

yes o_mnth_end_effrt_prev_mnth is a custom record load variable

use .getValue or may you need .getField

can you share more code? This isn't helpful much.

but im asking getFieldValue from null means im trying to access a field which dosent have any value but what does getFieldValue from undefined mean

It means that "o_mnth_end_effrt_prev_mnth" is undefined.

my code is in 1.0 so im using this getFieldValue()

it is.

yes

share the code

var s_effrt_json_2_prev_mnth = o_mnth_end_effrt_prev_mnth.getFieldValue('custrecord_json_mnth_end_effrt2'); var s_effrt_json_3_prev_mnth = o_mnth_end_effrt_prev_mnth.getFieldValue('custrecord_json_mnth_end_effrt3'); var s_effrt_json_4_prev_mnth = o_mnth_end_effrt_prev_mnth.getFieldValue('custrecord_json_mnth_end_effrt4');

add the log after each of those .getFieldValue() statement to know where your code is crashing.

ok