Duplicate string items breaking the gradle build


this is the first time m posting my problem ,So , plz ingore if I made any mistakes and suggest me. in my current android project below strings are used based on product.

<string name="insert_sd_card" product="nosdcard">"Por favor, inserte una tarjeta SD"</string>
<string name="insert_sd_card" product="default">"Por favor, inserte una tarjeta SD"</string>

When I ran the gradle build( tried with 0.7, 0.8,0.9) , getting below errors:

“***\res\values-es\strings.xml: Error: Found item String/insert_sd_card more than one time”.

can anyone help me please?

See the following post (and answer) on Stack Overflow: http://stackoverflow.com/questions/27541158/errorerror-found-item-string-photopickernotfoundtext-more-than-one-time/