Our intranet site stopped working over night. A short look into the errorlog showed

Question

Asked: June 18, 20262026-06-18T01:08:34+00:00 2026-06-18T01:08:34+00:00

Our intranet site stopped working over night. A short look into the errorlog showed me a

EntityCommandExecutionException - An error occurred while executing the command

with the inner exception

Devart.Data.Oracle.OracleException - {"ORA-00904: \"MONTH\": invalid identifier"}

The exception occurs during a selection with LINQ. The where statement simply compares DateTime‘s Month and Year against some integer.

The oracle table itself simply has 4 columns (number:id PRIMARY KEY, varchar2:text, number:sum, date: creationdate).

I can reproduce the problem local with a new devart model and with a ADO.NET entity model as well against the same database.

The environment:

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Editorial Team · Answer 1 · 2026-06-18T01:08:35+00:00

Editorial Team

Please check your .NET Framework version.

.NET v4.5 is supported by dotConnect for Oracle starting from the 7.2.77 version: http://www.devart.com/dotconnect/oracle/revision_history.html .

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