The activation of a dso request (green) isn't working.

Hello BW Experts, i ran a load in a dso and the loading is completed with green light but when i am trying to activate it, it's not being activated.

there's no response at all. the request remains green, dont go yellow at all to show it's activating.

why this is occuring ?

I followed below steps As some one said for this issue...But its not working for me. Please help.....

1. right click on dso
2. additional functions
3. generate export datasource

after this i selected the request again and click activate