About the pair to active/passive selection set numbers

I want to dock 2 siRNAs with single protein one at position near 184 and other near 440 but in active/passive selection set numbers box i am facing problem. In pair to active/passive selection set number box of molecule 2 i write 1 after clicking on next next red box appear to this and saying partner 4 not found. How to solve this

Did you solve this issue? If not provide the exact input/actions you are doing on the server page.