There is a standard expression “get in trouble”. The word trouble is used as an uncountable noun in this case. The word trouble tends to be used mainly as a collective noun.
The expression “no end of” means “a great deal of” / “a huge amount of”. This expression was added to the standard expression “get in trouble”.
I’d say trouble is used mainly as an uncountable (singular) noun than as a countable (plural) one.
Trouble is usually a noncountable noun and when used with “no end of” we don’t add an s. No end of trouble is a fixed phrase. We tend to use words like problems as countable nouns.
Thank you so much, Amy and Canadian45. Now I have got a clearer picture of the word as well as its usage. Your instructions also made me call to my mind that people say ‘a lot of trouble’ instead of ‘a lot of troubles’.
Thanks again and I wish I hadn’t got you two in no end of trouble with tooo many questions. (^o^)
Just to add a bit more on the topic remember the lines spoken by the three witches at the beginning of Shakespeare’s Macbeth as they forecast his future:
ALL. Double, double toil and trouble;
Fire burn, and caldron bubble
Just thought it might be appropriate for Hallowe’en!