The data type 'ULInt' is not a valid return type for the 'INT_TO_ULINT' function

Nice to meet you.

I am currently assigned a requirement to read process variables such as flow and turbidity using the HART protocol.

For this purpose, I found an example at the following URL:
https://support.industry.siemens.com/cs/de/en/view/109814023

For the project assigned to me, I have a PLC S7-1215C DC/DC/DC and an ET 200 I/O [IM 155-5 PN ST] with AI 4xI 2-wire 4-20mA HART_1

I proceed to copy the multiple instances and incorporate them into my project, when compiling an error is generated:

128,The data type 'ULInt' is not a valid return type for the 'INT_TO_ULINT' function.,,,9:23:08 AM

128,Parameters of the function or the function block do not match the transferred formal parameters.  ,,,9:23:08 AM

FILL_BLK(IN    := #INITIAL_BYTE_VALUE,

COUNT := INT_TO_ULINT(#READ_DATA_UPPER_LIMIT),

OUT   => #statReadRecord.data[0]);

238,The data type 'ULInt' is not a valid return type for the 'INT_TO_ULINT' function.,,,9:23:08 AM

238,Parameters of the function or the function block do not match the transferred formal parameters.  ,,,9:23:08 AM