Illustrator giving memory error

[#1]

ID: -108 is the message I get when the error pops up, that Illustrator does not have enough memory to complete the task. 

What I am doing is creating an offset path on an object so that I can create a die cut for a sticker. After creating the offset path, I then need to merge in pathfinder (unite). While it's merging, it takes sooooo long - like minutes long. Then, after so much time, I get the error.

PLEASE HELP!!! 

I have already: 

updated the OS

updated AI

Returned AI to default setting

What else can I try?

[#2]

ID: -108 is the message I get when the error pops up, that Illustrator does not have enough memory to complete the task. 

What I am doing is creating an offset path on an object so that I can create a die cut for a sticker. After creating the offset path, I then need to merge in pathfinder (unite). While it's merging, it takes sooooo long - like minutes long. Then, after so much time, I get the error.

PLEASE HELP!!! 

I have already: 

updated the OS

updated AI

Returned AI to default setting

What else can I try?

[#3]

Is it a complex file?