I could use help resolving this error.
InvalidTemplate. Unable to process template language expressions in action 'Send_an_email_(V2)' inputs at line '1' and column '2569': 'The template language function 'base64' expects its parameter to be a string, an object or an array. The provided value is of type 'Null'. Please see https://aka.ms/logicexpressions#base64 for usage details.'.
I've seen several similar issue posted and many have said the error appeared unexpectedly after previously working. My flow (see image below) is identical to one of my coworkers, however, I'm receiving the above error while his works as expected.
Any help is much appreciated.
Accepted Solutions
Hi @GB_Sun ,
I did a test on my side. If there is nothing in the newly created file, the same error will occur.
Please try to get size of the file using Get file metadata. If Size is 0, Send email action will not be executed.
Image reference:
Please take a try.
Best Regards,
@gamoraes
See the attached screenshot for the results of the flow.
I created the flow over the weekend. The first file in the folder was emailed and moved successfully; however, since then every test of the flow returns an error. I've tried deleting and re-adding the errored action several times. I've also re-made the flow from scratch and I get the same error.
Hi @GB_Sun ,
I did a test on my side. If there is nothing in the newly created file, the same error will occur.
Please try to get size of the file using Get file metadata. If Size is 0, Send email action will not be executed.
Image reference:
Please take a try.
Best Regards,
FYI: I was running into this issue and could not find a solution online, and it would work sometimes but not others. I ended up working through and finding out the cause.
Base64 strings have to have a length that is divisible by 4, if the length is not divisible by 4, they append '=' as a placeholder on the end of the string until it is divisible by 4. Microsoft Flow's decodeBase64() does not automatically append these =, so you have to check if mod(length(variables('X')) == 0, if not, append '=' to the string until it is. Then you can decode the string.
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