Can any one tell me how to connect specific trailhead playground URL from apex data loader?

I need to complete Lightning Exp challenge 8 (Importing data) but unable to do so. kindly suggest how to login TP from apex loader 

Challenge Not yet complete... here's what's wrong: 
There was an unexpected error in your org which is preventing this assessment check from completing: System.DmlException: Insert failed. First exception on row 0; first error: CANNOT_EXECUTE_FLOW_TRIGGER, The record couldn’t be saved because it failed to trigger a flow. A flow trigger failed to execute the flow with version ID 3016F000000U8PF. Flow error messages: An unhandled fault has occurred in this flow
An unhandled fault has occurred while processing the flow. Please contact your system administrator for more information. Contact your administrator for help.: []

please suggest. 

I am unable to Launch my Dev org after successfully completion of Unit 2 of User Authentication module from Trail Head.
I had changed domain name in order to complete test but from new domain also not able to launch my hands on  org.

Getting DNS error "cunning-raccoon-232668-dev-ed.my.salesforce.com’s server DNS address could not be found.". please suggest

Challenge Not yet complete... here's what's wrong: 
There was an unexpected error in your org which is preventing this assessment check from completing: System.DmlException: Insert failed. First exception on row 0; first error: CANNOT_EXECUTE_FLOW_TRIGGER, The record couldn’t be saved because it failed to trigger a flow. A flow trigger failed to execute the flow with version ID 3016F000000U8PF. Flow error messages: An unhandled fault has occurred in this flow
An unhandled fault has occurred while processing the flow. Please contact your system administrator for more information. Contact your administrator for help.: []

please suggest. 

Has anyone completed this trail? I am stomped on challenge number 3, regarding created the process for fulfillment. Any pointers or guidance would be appreciated.
 

Hi,

 

Can someone guide us like how can we remove the timestamp from the DateField Value.

 

Ex: Suppose i have Date value like 2011-11-15 00:00:00 then i want to print only 2011-11-15.

 

Please share your thoughts on this.

 

Regards

G. Surender