You can't use decisions spread across more than 1 port in the one statement. Either change your code to 2 lines with 'If' statements (or change your hardware so that the 2 pins are in the same port).
That wont work, when the second b0 is inside the first.
<code><pre><font size=2 face='Courier'>
if b0=0 then
if portc pin0 =1 then
goto jump1
endif
else
if portc pin0 =0 then
goto jump2
endif
endif
</font></pre></code>