Sorry, I assumed you were using an 18F, which can have problems with EEPROM Math.
Since you are using a 16F628, please ignore my previous comment.

Not sure why you would get that error with a 16F, so give this a try and let me know what happens.
Set you're OSC and LCD defines first ...
Code:
<font color="#0000FF"><b><i>'----[EEPROM DATA]----------------------------------------------------------
</i></b></font><b>EEstring1  </b><font color="#008000"><b>DATA </b></font><font color="#FF0000">&quot;Hello World!&quot;</font>,<font color="#800000"><b>0        </b></font><font color="#0000FF"><b><i>; null-terminated strings in EEPROM
</i></b></font><b>EEstring2  </b><font color="#008000"><b>DATA </b></font><font color="#FF0000">&quot;Didn't expect That.&quot;</font>,<font color="#800000"><b>0

</b></font><font color="#0000FF"><b><i>'----[Variables / Aliases]--------------------------------------------------
</i></b></font><b>Idx     </b><font color="#008000"><b>VAR BYTE                 </b></font><font color="#0000FF"><b><i>' String Index pointer
</i></b></font><b>Char    </b><font color="#008000"><b>VAR BYTE                 </b></font><font color="#0000FF"><b><i>' Character to display
</i></b></font><b>String  </b><font color="#008000"><b>VAR BYTE                 </b></font><font color="#0000FF"><b><i>' Pointer to String in EEPROM memory

'----[Initialization]-------------------------------------------------------
</i></b></font><b>CMCON  </b>= <font color="#800000"><b>7
</b></font><font color="#008000"><b>LCDOUT </b></font><font color="#800000"><b>$FE</b></font>,<font color="#800000"><b>1</b></font>:<b>FLAGS</b>=<font color="#800000"><b>0</b></font>:<font color="#008000"><b>PAUSE </b></font><font color="#800000"><b>250</b></font>:<font color="#008000"><b>LCDOUT </b></font><font color="#800000"><b>$FE</b></font>,<font color="#800000"><b>1</b></font>:<font color="#008000"><b>PAUSE </b></font><font color="#800000"><b>250 </b></font><font color="#0000FF"><b><i>' Initialize LCD

'----[Main program loop]----------------------------------------------------
</i></b></font><b>Main</b>:
    <font color="#008000"><b>LCDOUT </b></font><font color="#800000"><b>$FE</b></font>, <font color="#800000"><b>1                             </b></font><font color="#0000FF"><b><i>' Clear LCD screen
    </i></b></font><b>String </b>= <b>EEstring1 </b>: <font color="#008000"><b>GOSUB </b></font><b>EEString2LCD   </b><font color="#0000FF"><b><i>' Display String1
    </i></b></font><font color="#008000"><b>PAUSE </b></font><font color="#800000"><b>1000
    </b></font><font color="#008000"><b>LCDOUT </b></font><font color="#800000"><b>$FE</b></font>,<font color="#800000"><b>$C0                            </b></font><font color="#0000FF"><b><i>' move cursor to Line2
    </i></b></font><b>String </b>= <b>EEstring2 </b>: <font color="#008000"><b>GOSUB </b></font><b>EEString2LCD   </b><font color="#0000FF"><b><i>' Display String2
    </i></b></font><font color="#008000"><b>PAUSE </b></font><font color="#800000"><b>1000
</b></font><font color="#008000"><b>GOTO </b></font><b>Main                                     </b><font color="#0000FF"><b><i>' Rinse &amp; Repeat

'----[Display the specified EE string]--------------------------------------
</i></b></font><b>EEString2LCD</b>:
    <b>Char </b>= <font color="#800000"><b>$FF                                </b></font><font color="#0000FF"><b><i>' Make sure Char &gt; 0 to start
    </i></b></font><b>Idx </b>= <font color="#800000"><b>0                                   </b></font><font color="#0000FF"><b><i>' start at beginning of string
    </i></b></font><font color="#008000"><b>WHILE </b></font><b>Char </b>&gt; <font color="#800000"><b>0                            </b></font><font color="#0000FF"><b><i>' do Null-terminated string
       </i></b></font><font color="#008000"><b>Read </b></font><b>String </b>+ <b>Idx</b>, <b>Char                </b><font color="#0000FF"><b><i>'    get the character 
       </i></b></font><font color="#008000"><b>IF </b></font><b>Char </b>&gt; <font color="#800000"><b>0 </b></font><font color="#008000"><b>THEN LCDOUT </b></font><b>Char           </b><font color="#0000FF"><b><i>'    display the character,If>0
       </i></b></font><b>Idx </b>= <b>Idx </b>+ <font color="#800000"><b>1                          </b></font><font color="#0000FF"><b><i>' point to next character
    </i></b></font><font color="#008000"><b>WEND
RETURN

</b></font>