error: invalid instruction operand (on .ENDW)

Question

include irvine32.inc

.data
i dword 0
j dword 0
x dword 0
reservedseats byte 45 dup(0)
seats dword 45

.code
main proc

xor eax,eax
xor ecx,ecx
xor ebx,ebx
.while(i<45)
xor edx, edx
mov edx, i
.if([reservedseats+edx]==0)
    mov ebx,i
    mov x,ebx
    push ecx
    .while(j<seats)
    mov reservedseats,1
        inc i

    inc j
    .endw
    pop ecx
    jmp next
.endif


inc i
.endw
next:

 exit 
 main endp
 end main

This is an assembly (masm32) code.

I am working on assembly project seat reservation. I am trying to convert c++ code to assembly. this progrm will print seats given by users and if user wants to reserve seat again he will skip seats that are already reserved.

It gives me an error. The error(invalid instruction) is on first .endw after inc j.