Our requirement is launching the process model from external system and opening

Our requirement is launching the process model from external system and opening the first form in appian in pop-up.
for that we have created below intutative URL for start form of process model.
172.18.1.27:8080/.../configureprocess.simplepopup

Scenario
Please refer the attachment.
1. We have 3 process model
          a. Parent Process
b. Sub Process A
          c. Sub Process B
2. We have created Intutive URl for the parent process model start form,Parent process is calling two sub processes based on the condition.
3. we are able to open first user input task of sub process A, as we have chaning in all node, but we are not able to open the task of Sub process B after first task of Sub process A gets submitted
4. Its giving the below error. "the web page you are viewing is trying to close the tab. do you want to close the tab"
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OriginalPostID-100605

OriginalPostID-100605