[Plugin: CalculatorPro Calculators] error

Fatal error: Cannot use object of type WP_Error as array in D:\inetpub\wwwroot\development\wp-content\plugins\calculatorpro-calculators\calculatorPro.php on line 87

I get this error above with wordpress 3.4.2 and 3.4.1

the page is set to display

[calc id=2110]

</ br>

[calc id=2813]

</ br>

[calc id=522]

</ br>

[calc id=586]

</ br>

[calc id=440]

</ br>

[calc id=525]

</ br>

[calc id=1980]

</ br>

[calc id=2419]

</ br>

[calc id=2036]

</ br>

[calc id=1573]

http://wordpress.org/extend/plugins/calculatorpro-calculators/