There is no mistake that ruin awaits you.
请问这句话的字面意思是什么？

顶

同位语

dddd

Noun + that-clause:
We use a noun + that-clause to express opinions and feelings, often about certainty and possibility. We also use that with reporting nouns. Some nouns commonly used in this way are belief, fact, hope, idea, possibility, suggestion, statement, claim, comment, argument:
e.g. He is also having intensive treatment in the hope that he will be able to train on Friday.
e.g. Dutch police are investigating the possibility that a bomb was planted on the jet.
[Source: Cambridge Dictionary]

这句话语法正确吗？lz从哪里看来的？

其实我会投一票补语。如果是同位语，那么它所解释说明的、与它地位相同的成分是什么？显然不是mistake