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From the error message, it seen the value you are passing in to trigger parameter is not valid and resulting in the error.
Kindly recheck if you are passing valid value in to trigger or not. Check the parameter type too to make sure to pass valid value.
Hope this helps. Please let me know how it goes. If not, kindly share more details about your pipeline parameters and trigger configurations and values you are passing there. so that I can try same at my end and help better. Thank you.
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