Plugin could not be activated because it triggered a fatal error.

Fatal error: Allowed memory size of 33554432 bytes exhausted (tried to allocate 136985 bytes) in /home/benicio/public_html/wp-content/plugins/simple-google-sitemap-xml/simple-google-sitemap-xml.php on line 108

tried to update my google sitemap wordpress plugin but i receive this error.
what does this mean and how can i solve this please?

<table width="50%">
<tr>
<p style="font-weight:bold;">Homepage parameters</p>
<th width="150">Priority</th>
<td width="100">
<select name="gsxml_hp" id="gsxml_hp" type="text" value="<?php echo get_option('gsxml_hp'); ?>" />
<? for ($i=0; $i<1.05; $i+=0.1) {
echo "<option value='".$i."' ";
if (get_option('gsxml_hp')==$i) {
echo ' selected';
} // end if

echo ">";
if($i==0) { echo "0.".$i;}
elseif($i==1.0) { echo $i.'0';}
else {echo $i;}
echo "</option>";
} // end for
?>
</select>
</td>
<th width="150">Frequency</th>
<td width="100">
<select name="gsxml_hf" id="gsxml_hf" type="text" value="<?php echo get_option('gsxml_hf'); ?>" />
<option value="always" <?if(get_option('gsxml_hf')=="always") {echo 'selected';}?>>always</option>
<option value="hourly" <?if(get_option('gsxml_hf')=="hourly") {echo 'selected';}?>>hourly</option>
<option value="weekly" <?if(get_option('gsxml_hf')=="weekly") {echo 'selected';}?>>weekly</option>
<option value="monthly" <?if(get_option('gsxml_hf')=="monthly") {echo 'selected';}?>>monhtly</option>
<option value="yearly" <?if(get_option('gsxml_hf')=="yearly") {echo 'selected';}?>>yearly</option>
<option value="never" <?if(get_option('gsxml_hf')=="never") {echo 'selected';}?>>never</option>
</select>
</td>
</tr>
</table>

this line <td width="100"> was the 180 line. any solutions please?

This means you are trying to use memory size which is larger than the allowed one that is set in your php.ini file.

Try to increase "memory_limit" in php.ini file.

or

just add this to the top of the page,

ini_set("memory_limit","128M");

Before trying the above, just go through your code. You are using too much of memory and this is not good in a programming point of view.