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Ashwin Varma 2Ashwin Varma 2 

This page has an error. You might just need to refresh it. Error in $A.getCallback() [Action failed: ltng:require$controller$init [this._then is not a function]] Failing descriptor: {ltng:outApp}

Does anyone have any Idea about below error

This page has an error. You might just need to refresh it. Error in $A.getCallback() [Action failed: ltng:require$controller$init [this._then is not a function]] Failing descriptor: {ltng:outApp}
SwethaSwetha (Salesforce Developers) 
HI Ashwin,

The relevant code is not provided but based on the error provided, this._then is not a function error indicates that the component is not properly initialized. 

The ltng:outApp descriptor is pointing to Lightning Out component. Ensure that the Lightning Out App configuration is correct. Check that the ltng:outApp component is properly defined with the required attributes, such as access and ltng:require components for loading dependencies.

Related: https://salesforce.stackexchange.com/questions/248210/getting-error-you-might-just-need-to-refresh-it-error-in-a-getcallback-using

If this information helps, please mark the answer as best. Thank you