Off topic:Error: reads file does not look like a FASTQ file

Question

[AHW]

I am trying to use bowtie tool to align ecoli paired end reads. My files extension is .fq. The reads look like

@r0/1
TATTCTTCCGCATCCTTCATACTCCTGCCGGTCAG
+
EDCCCBAAAA@@@@?>===<;;9:99987776554
@r1/1
TGATAGATCTCTTTTTTCGCGCCGACATCTACGCC
+
EDCCCBAAAA@@@@?>===<;;9:99987776554
@r2/1
CACGCCCTTTGTAAGTGGACATCACGCCCTGAGCG
+
EDCCCBAAAA@@@@?>===<;;9:99987776554
@r3/1
CGATGCAGATGCGTACCACCTGGACCAGGCCTTTC
+
EDCCCBAAAA@@@@?>===<;;9:99987776554

and I think the reads are in fastq format. But I get the error: on using the following command

bowtie index -1 file1 -2 file2 output

Error: reads file does not look like a FASTQ file

I am not sure what is going wrong.