This is the 11212th most frequent Swedish word.
misslyckandenas
"Of the failures" (possessive plural form).
Here, 'misslyckandenas' is used in the genitive form to denote possession or of-property of 'consequences'.
Vi lär oss av misslyckandenas konsekvenser.
We learn from the consequences of failures.
The word 'misslyckandenas' is genitive plural, referring to the lessons learned from multiple failures.
Historien är full av misslyckandenas läxor.
History is full of lessons from failures.
In this usage, 'misslyckandenas' describes the origin or the cause of the pain leading to success.