MIPS Assembly Syntax Errors

Hi, I have just started using MIPS assembly language, and I am trying to convert a piece of C code to MIPS. The C code is as follows:

int fact(int n){ 
  if(n<1) return 1; 
  else return n * fact(n-1); 
 }    
   int perm(int n, int k) 
  { 
  return fact(n)/fact(n-k);//calls another procedure 
  }  
  int main(){
   int n = 10, k=5; 
   printf(“%d\n”, perm(n,k)); 
   return 1; 
  }

This code finds permutations as calculated by n!/(n-k)!
The MIPS code I have written has several errors that I cannot figure out:

.text
.globl main

main:
	ori	$t1, $0, 0x10	#initialize n = 10
	ori	$t2, $0, 0x5	#initialize k = 5
	ori	$t3, $0, 0x0	#initizlize temp = 0

	jal	perm		#call perm(n, k)
	move	$t3, $v0	#save result to temp

	li	$t3, 4		#specify print value
	syscall			#print

fact:
	addi	$sp, $sp, -8	#allocate bytes
	sw	$ra, 0($sp)	#save return address
	sw	$a0, 4($sp)	#save argument

	slti	$t0, $a0, 1	#test for n < 1
	beq	$t0, $0, L1	#if n >= 1, goto L1
	
	addi	$v0, $0, 1	#if n < 1, return 1
	addi	$sp, $sp, 8	#deallocate bytes
	jr	$ra		#return

L1:	addi	$a0, $a0, -1	#decrement n
	jal	fact		#call fact (n)
	
	lw	$ra, 0($sp)	#load return address
	lw	$a0, 4($sp)	#load argument
	addi	$sp, $sp, 8	#deallocate bytes

	mul	$v0, $a0, $v0	#multiply n, n - 1
	jr	$ra		#return

perm:
	sub	$sp, $sp, 16	#allocate bytes
	sw	$ra, 0($sp)	#save return address
	sw	$s0, 4($sp)	#save temp register
	sw	$a0, 8($sp)	#save arg0 (n)
	sw	$a1, 12($sp)	#save arg1 (k)

	jal	fact		#call fact(n)
	move	$s0, $v0	#save result to temp

	lw	$a0, 8($sp)	#load arg0 (n)
	lw	$a1, 12($sp)	#load arg1 (k)
	sub	$a0, $a0, $a1	#n - k
	jal	fact		#fact(n - k)
	div	$s0, $s0, $v0	#fact(n)/fact(n - k)
	move	$v0, $s0	#save temp to result
	
	lw	$ra, 0($sp)	#load return address
	lw	$s0, 4($sp)	#load temp register
	addi	$sp, $sp, 16	#deallocate bytes

	jr	$ra		#return

The errors I get are:
Exception occurred at PC=0x00000000
Bad address in text read: 0x00000000
Attempt to execute non-instruction at 0x80000180

I don't understand what these mean. Any help is greatly appreciated!