Invaild SSML Output error after capturing user input

I’m getting this error after prompting and capturing the user input. this part is the skill is simply taking the input of the user requesting an episode name of a podcast i run, forward the query to API and that sends back the url to play the episode, along with the title, description and cover artwork url (for the alexa enabled displays). and mapped all to the streaming player. I dont see this general entity "nbsp"in voiceflow (obviously that represents empty space.

the part of the skill which the problem is occurring