Error in Formula

[anillinda]

A	B	C	D	E	F	G	H	I
No	Description	Date Purchased	Cost	Prior Depreciation	Life	Current Depreciation	Type
1	Truck	09/3/2014	28182	16438	5	?	Auto

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I am using the following formula, which is giving me error. Can someone trace the mistake? Cell I2 has date 07/31/2018

IF((EDATE(I2,-12))< c4,(sln(d4,0,f4),0,if(and(c4 >=EDATE(I2,-12)+1,C4<=I2,SLN(D4,0,ROUNDUP(YEARFRAC(C4,DATE(IF(MONTH(C4) >7,YEAR(C4)+1,YEAR(C4)),7,31))*12,0)/12),0)))<c4,(sln(d4,0,f4),0,if(and(c4></c4,(sln(d4,0,f4),0,if(and(c4>

 

[Yongle]

something inconsistent in red

IF((EDATE(I2,-12))< c4,(sln(d4,0,f4),0,if(and(c4 >=EDATE(I2,-12)+1,C4<=I2,SLN(D4,0,ROUNDUP(YEARFRAC(C4,DATE(IF(MONTH(C4) >7,YEAR(C4)+1,YEAR(C4)),7,31))*12,0)/12),0)))