Error evaluating init fcn callback

Hello i have a custom installed library. When i use the block from the libary in my simulink model , i got an error saying " Error evaluating 'InitFcn' callback of AMS ADC Interface block (mask). The code written in block properties for init fcn is as given :

app123 = getenv('EN_LIB_PATH');

app123=[app123 '\src'];

copyfile(app123,'.');

I think the EN_LIB_PATH should be replaced with the libary path. But I'm confused. Should I use the path to the folder/libary or the slblocks.m file ?

please get me a solution soon. matlab version : R2012a