Zhè / jiàn / shì / yuàn / bu / de / nǐ / zhǔ / yào / shì / wǒ / de / pàn / duàn / chū / le / wèn / tí.

这件事怨不得你，主要是我的判断出了问题。

You cannot be blamed for this; the problem was mainly my judgment.