"很多错误使得此次尝试无功而返"翻译成英语怎么说？

Many flaws make this attemp end up in vain.

the lots of mistakes make them get nothing from this trying

This attempt failed thoroughly because of many flaws.

Many mistakes made this attempt wasted.

flaw is a weak point rather than a mistake. If what you mean is errors that unexpected, use mistake; past tense is to be used in this sentence; ineffectual is too formal and not used often.

A lot of mistakes make this attempt have no effect

lots of mistakes make this attempt unsuccessful