Operand types do not match assembly

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assembler

I just have started to learn assembly. I made program below but compiler showed two error messages to me. First one is in the line number 30. The content of the message is: Operand types do not match. The content of the second message is: Unexpected end of file encountered. Its in the line nr. 34. I am using TASM compiler. The program main task is find the smallest number of the array.

              .MODEL  huge                   ;1
                                              ;2    
.code                                         ;3
ORG    256h                                   ;4   
                                              ;5  
                ASSUME  CS:Dane, DS:Kod, SS:  ;6
                                              ;7   
Start:                                        ;8      
                                              ;9 
DL_TABLICA      EQU     10                    ;10   
Tablica         DB      01h, 02h, 00h, 10h, 12h, 33h ;11
                DB      15h, 09h, 11h, 08h, 0Ah, 00h ;12
Najmniejsza     DB      ?                      ;13   

                jmp     Poczatek               ;15

Poczatek:                                       ;17
                mov     ah, [si]                ;18
                mov     dx, DL_TABLICA          ;19

Petla:                                          ;21
                mov     bx, SEGMNT Tablica      ;22
                cmp     dl, [bx]                ;23
                jae     Petla                   ;24  
                mov     al, [di]                ;25
                dec     bx                      ;26  
Skok:                                           ;27
                loop     Skok                   ;28

                mov     ax, Najmniejsza          ;30

                mov     ax, 4C13h                ;32
                int     21h                      ;33 

 Dane END                                        ;34

What I have tried:

I tried to replavce

mov     ax, Najmniejsza

with

movzx ax, byte ptr Najmniejsza 

but its still does not work.