[tlaplus] TLA+ verification trace question。

Hello, I am using TLA+ to implement trace verification, and output the following error, what is the reason?

background：
Ideally, the trace log collection is as follows（<<[myId |-> 3, sid |-> 2], [myId |-> 3, sid |-> 1], [myId |-> 2, sid |-> 1]>>）, but there is a problem with the interface I implemented, please help to solve it, thank you very much.

* parses the log to a TLA+ sequence of TLA+ records
ExSeqRcdParser(path) == CHOOSE r \in Seq([myId:Int,sid:Int]):TRUE

package tlc2.overrides;
import tlc2.value.impl.;
import util.UniqueString;
import java.io.;
import java.util.*;

public class ExternalSeqRecordParser {
// @TLAPlusOperator(identifier = "ExSeqRcdParser", module =
// "ExternalSeqRecordParser")

public static Value ExSeqRcdParser(final StringValue absolutePath) throws IOException { // read the log file at [absolutePath] BufferedReader br = new BufferedReader(new FileReader(absolutePath.val.toString())); // initialize array for all parsed records List<RecordValue> rcdSeq = new ArrayList<>(); try { String line = br.readLine(); while (line != null) { // initialize arrays for field values [fields] and [values] List<UniqueString> fields = new ArrayList<>(); List<Value> values = new ArrayList<>(); // split string on seperator into array of filed and value String[] lnarr = line.split(","); // parse each entry of [lnarr] as a field-value pair parsePair(lnarr[0].split(":"), fields, values); parsePair(lnarr[1].split(":"), fields, values); // add record to the sequence rcdSeq.add(new RecordValue(fields.toArray(new UniqueString[0]), values.toArray(new Value[0]), true)); line = br.readLine(); } } finally { br.close(); } // return the aggregated sequence of records return new TupleValue(rcdSeq.toArray(new Value[0])); } private static void parsePair(String[] pair, List<UniqueString> fields, List<Value> values) { fields.add(UniqueString.uniqueStringOf(pair[0])); if (pair[1].equals("false") || pair[1].equals("true")) { values.add(new BoolValue(Boolean.parseBoolean(pair[1]))); } else { values.add(IntValue.gen(Integer.parseInt(pair[1]))); } } /* * <<[myId |-> 3, sid |-> 2], [myId |-> 3, sid |-> 1], [myId |-> 2, sid |-> 1]>> */