les Exception, clarification

Code:

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at java.util.Arrays.copyOf(Unknown Source)
	at java.lang.AbstractStringBuilder.expandCapacity(Unknown Source)
	at java.lang.AbstractStringBuilder.append(Unknown Source)
	at java.lang.StringBuilder.append(Unknown Source)
	at fmin.N_Et_N_2N(fmin.java:232)
	at fmin.treeFmin(fmin.java:81)
	at fmin.main(fmin.java:430)

Bonjour
voici l'erreur que j obtiens, je ne comprends pas grand chose
Merci de me clarifier