Dalvik Verifier Error with FieldElement

[Ajibola]

Getting the error below potentially related to this error

java.lang.VerifyError: Verifier rejected class com.caligochat.nacl.Curve25519: com.caligochat.nacl.Curve25519$FieldElement com.caligochat.nacl.Curve25519.feMul(com.caligochat.nacl.Curve25519$FieldElement, com.caligochat.nacl.Curve25519$FieldElement) failed to verify: com.caligochat.nacl.Curve25519$FieldElement com.caligochat.nacl.Curve25519.feMul(com.caligochat.nacl.Curve25519$FieldElement, com.caligochat.nacl.Curve25519$FieldElement): [0x14] Invalid reg type for array index (Precise Reference: long[]) (declaration of 'com.caligochat.nacl.Curve25519'