ECC+ - EasyCalcCheck Plus Shows "Notices" when validating

When i validate a form the plugin shows notices:

Notice: Undefined offset: 0 in /homez.467/acbbrugb/www/plugins/system/easycalccheckplus/easycalccheckplus.php on line 78

Warning: mt_rand() [function.mt-rand]: max(-1) is smaller than min(0) in /homez.467/acbbrugb/www/plugins/system/easycalccheckplus/easycalccheckplus.php on line 80

Notice: Undefined offset: 0 in /homez.467/acbbrugb/www/plugins/system/easycalccheckplus/easycalccheckplus.php on line 81

Notice: Undefined offset: 0 in /homez.467/acbbrugb/www/plugins/system/easycalccheckplus/easycalccheckplus.php on line 156

Notice: Undefined offset: 0 in /homez.467/acbbrugb/www/plugins/system/easycalccheckplus/easycalccheckplus.php on line 164

Notice: Undefined offset: 0 in /homez.467/acbbrugb/www/plugins/system/easycalccheckplus/easycalccheckplus.php on line 186

Do you know haw i can hide them ?

(I use joomla 1/7)

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