Hi Robert , the code looks good and the same code is working in our live environments (Test and Prod) and compiles without any issue.

Since the routine has REST WebService endpoints and due to company's policy I am not able to post the code but thanks for your concern.

As Colin mentioned, it must be the file corruption, will try reinstalling the dev environment again.

Hi @Colin Brough,

Did you guys manage to resolve this issue? 
I was having the same issue while compiling few local server classes (LF) that extends %CSP.REST class and if I remove the "Extends  %CSP.REST" from the classes, they would compile successfully but the RESP API would give error.

• Tried reinstalling the cache thinking it would flush out the issue but still stuck in the same one.
• Tried changing the end of line sequence from VS Code but could not save it.

I would appreciate if you could share how you have resolved this issue.

Sounds good. 

But in my case, the response would not take too long and sometimes it's just a matter of sec.

I am not very confident about the feasibility of breaking a single request into 3 requests from the user point of view but will discuss with my colleagues about this solution.

Thanks @Danny Wijnschenk